Just the 5x8 trailer alone is $500 at harbor freight, not including registration (which depends on the state). So you’re dead in the water before you even start, unless you buy used, which we won’t be able to help you with.
There are DIY options for teardrops, but it’s a moot point because your budget is so low.
>>2760468Reddit has an entire sub dedicated to doing this in just Priuses (