As the other guy said you can scour aliexpress, but I suggest you be careful as a lot of chinesium power supplies lack protections.
Meanwell does get pretty close to fulfilling your requirements near that budget, their standard enclosed supplies seem to go up to 56v, and it looks like they have an open frame one that does 58v. Unless you absolutely need 60v on your bench riden power supply, you can just settle on a meanwell.