It's better to use criteria other than price to determine the gun you will get.
The cheaper guns have a place in airsoft, my first primary gun, was a mere £155 + £32 for charger/battery. It's from a reputable budget line, in the upper tier of budget guns, imo, you get off budget guns between £180 and £250. But theres plenty of good stuff in the 100-200 range, but not really in the sub £100 range.
Please tell us, how much of your budget is for other gear?