I've been on a DIY PSU kick for a few months now, these Multicomp torroidal transformers seem like a good deal at MCM Electronics (this is a "hobbyist" oriented retail site owned by Farnell, same owner as Newark in USA). Comes with mounting hardware. Usually these are expensive to ship from eBay Chinese sellers.
I picked up a few 50VA for ~$15 each.
http://electronics.mcmelectronics.com/search?p=Q&lbc=mcmelectronics&ts=custom&w=torroidal%20transformer&method=and&view=list&af=&isort=price (http://electronics.mcmelectronics.com/search?p=Q&lbc=mcmelectronics&ts=custom&w=torroidal%20transformer&method=and&view=list&af=&isort=price)
A minute of Googling should yield a 10% off code. Shipping is $8.