Keep a close watch on Ebay, looking for good quality used tools. These sometimes might be quite old, but are far far better than the Chinese rubbish so common today.
I've popped the threads into the metal forming section.
Don't know where to get them. 20 years ago paint shops would sell Sykes Pickavant stuff which was quite nice. Nowadays they sell that standard kit of Chinese stuff which I don't like as the hammers are too rounded (unevenly too - I've got a set and use an ordinary small hammer instead) and the dollies have sharp edges and are most of the useful ones are too light in weight.
I recently used eBay for a second hand dolly. Worth thinking up brand names and doing a Google Search.
Regular hammers n dollies... Kennedy kit is nice and better value than Sykes-Pickavant (not as wide of a range though), available from Countour Autocraft and Cromwell Industrial. Bossing mallets/tinmans mallets are typically available form all sorts of places
Its the same here in Aus, you can buy cheap **** or really expensive stuff and little between. Theres a group on yahoo called metalshapers, and they have a website as well, they have some great tutes on making and using all sorts of hand and power tools. You can make beater mallets from baseball bats, slappers from car springs and then some of them can get really involved including english wheels, pnumatic planishing hammers and helve hammers. One thing my grandfather always told me was if your going to buy tools buy the best you can, and if you look after them they will look after you
Now that we have Ebay its often possible to get good quality used tools for less than pretty poor Chinese type stuff, and its possible to find most things if you look on a regular basis.