I use a set I got from Harbor Freight for around $30. The dollies are forged not cast and the hammers have worked well so far. Just beware of the very cheap sets that use cast dollies. They are downright dangerous in terms of breaking and pieces coming off.

If I were to make my living at this I would probably spend more $ for better quality but these get the job done for me. Better to spend the money I saved on a good Lincoln wire feed welder which is also a requirement for fixing up these old trucks it seems.