EDgun Options for ~ 300-350 cc air tanks for Leshiy 2?

I'm using an aluminum one from ebay based on some recommendations online. It has been working great for two years now and it was 50€ or something.

The only two problems are with locking (the longer lock pin would work fine or you can cant the bottle a bit which is what I've done) and with the weight (I'm using it on a bipod so also no problems here).

I do plan on going carbon eventually but for now I'm happy.
 
I know Edgun has it for $300, any other alternatives or ebay recommendations?
If you’re going for a carbon fiber tank just go all the way and get the 470cc that’s sized for the L2. Edgun West and Edgun.shop should both have it. For Black Friday last year they had it for $220