Hello, Everyone!
We are running new product - the son of online store and casino. Here you can get electronics, luxury devices etc. much cheaper then they cost on market with the help of smart gambling feature.
The question is:
What kind of traffic sources could be the most relevant for such product? We need to test audience and specify future targeting in terms of age, interests, etc.
Thank you 
Pop traffic would be worth a shot - but it won't allow you to target by demo (age/interests/etc.)
FB would be ideal for targeting demographics, but I don't know if the gambling aspect of the service would be allowed or not.
Also - when I click on "Open Box" the sudden noise startled the heck out of me - you may want to change it to something less scary and set a lower volume to avoid turning away potential customers...
Amy
I like the novelty of this, but I am not sure who would be the ideal target for this as a consumer.
I guess social proof would work well - "Look, here's what I got for only X" that would hopefully trigger some "I want that too responses"
One thing to test: I once read (can't remember where) that sales did best for lotteries when the prize was massive, not when the chances of winning are best.
A high prize really brings out the gamblers. Best odds are for more rational people, which might not be your target.
Also, think of the angle: "My odds are X% to win" or - Unbelievable, I got this 5K drone for a fiver.
Just some thoughts...
I think Facebook is a good source for this. What you have to do though is email support and see if they can approve you to run this. Their policy says that gambling is not banned but you need prior approval and you can only target 18+ or whatever the legal age is for this in certain geos. You will also have some geos unavailable for this since any sort of gambling is banned there.
I don't quite get how this works ... what does it mean to open a box?
FB Would be great for this if approved. You can even test targeting various games that have a similar "loot box" mechanic like CS:GO and Overwatch - people go crazy over this stuff, I like your store idea! Curious to see if it works!
For ideas on how to run this, I'd look at how the old "daily deals" sites used to run when they were at their height.
The demographics for Groupon et al would seem likely to be very similar.
Also, the various pay-to-bid sites seem to appeal to a similar demographic - MadBid and so on.
Strong similarities in the key benefits, so looking at how they advertised - and to whom - could provide you a lot of ideas on how to get your product out there.
It means that you can open the box for 19$ only and get iPhone or iPad, or something cheaper then 19$. But anyway you will win something.

"Penny auctions" is also the term I was looking for!
It does indeed sound very similar.
First off, hats off to you for coming up with this idea. While it's somewhat similar to penny auctions, it's totally unique and something I've never seen before. Naturally being an online marketer for over 10yrs I spot out super scammy stuff lightening fast and it's rare when something potentially excites me, your site did.
I will say that I was 100% confused on WTF your site was and how it worked until I read an explanation in the comments above, this is something I think you must absolutely fix before going prime-time with the site. Make it 100% clear that for $x they are 100% guaranteed to win a prize in that box, which may be either worth less than their $x investment or worth 50x more.....etc. You get the idea here.... I'm a nerd and if I'm confused, regular people are going to be completely lost and click away.
If you can run this on Facebook with their express approval ahead of time, with the right marketing strategy I see this as a multi-million dollar business. Of course a ton of variables in that, but its unique and interesting, especially since "everyone wins". I can also see this working with display marketing, affiliate marketing and TV marketing...etc.
I think the site definitely needs work so that it builds a lot more trust with the user.
Having typos on the site does not help, but also, it is not at all clear how this works, and no real examples of people who have actually won from this. There is no about us page, and everything is in USD even if accessing the site from the UK. Finally, I am not sure what Drakemall is supposed to mean ... the name probably should be changed. Right now, the site does feel rather scammy.
I think if you can fix these things, you will have a much better shot at this as a business.
+1 to the "I have no idea what the heck this site is about when I first get there" camp. It's also really hard to even find info on what's going on.
Edit - I take that back.It's not really hard. I literally can't find anything. I click on the terms of use and privacy policy tabs and it takes me no where except back to the top of the homepage.
The number 1 rule of online marketing "don't make the user think"
If people need to spend time trying to figure things out, you have already lost the game.