Sounds like just an abysmal buy for you!

1. You all ready have a 17.
2. The price is an absolute joke!
3. With that high a starting price I have my doubts that you'll be able to get them down to a reasonable price, let a lone a good price.
4. You don't have the money to buy it.
5. If you're selling/trading guns with this store you won't get anything remotely close to what they're worth.

Sorry, but I can't even imagine entertaining the idea of buying this gun in your situation.