The HF hammers/dollys are a good buy for a one car project.. well unless you are going from flat sheet to a finished panel then probably not... but for $30 you can start to bang on metal and get good results.
I was just at the Carlisle spring show in PA and didn't see much as far as tools go... so waiting for a swap meet (and the $10 parking and the $10 entrance and $30 food bill) to chance upon a dolly or hammer you need may not be something you want to do.
