You'd be luckier finding a used car with your budget regardless if you go with a sniper rifle, gas blowback gun, or AEG. If you seriously want to get into airsoft, you'll need a bigger budget no "if", "and", or "buts" about it. Save up.
An example of what to expect. My first AEG was $650, first pistol was $400, all my gear comes up to $700, my total expenditure this year on airsoft (my first year) was almost $4000.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)