I did most of the equipment buying when my wife setup her design
studio in 1975. At that time, it was horendously expensive.
Happily for you, that has changed with eBay, Craigslist and Harbor
Frieght & Salvage.
http://www.harborfreight.com/ (has many jewelry tools including
rolling mills) CHEAP!
[Ebay link removed. Sorry no Ebay links on Orchid]
http://craigslist.org/ (select your state and city)
You might also contact your local or state crafts organization.
Colorado where we are has the Colorado Metalsmiths Association, for
example. Good luck.
serving metalsmiths since 1975