How much can i sell my utg l96 for?

I got an Utg l96,4 mags,bipod,and a red dot scope...First time using a sniper and dont like zeroing scopes. But The only problem is that there is no gear box cause mine came with a crappy 1 but metal ones are only 20 ish so ? Any idea how much i can get for that on craigslist ? Thanks