My AEG I just bought, my first btw, cost me $340. It's a Classic Army M15A4 Sportline Full Metal.
Not to mention the other money I've spent so far on boots, gloves, marpat pants, goggles. Still have yet to get my vest and the mags I want. I'd say I'm at about $500 maybe $600.
Like other have said in other posts, getting into airsoft will run you about a $1000 start-up cost. Maybe not all at once, but theres no avoiding it without problems down the road.
ShelledPants: In for Operation PunkBuster. - Link