I had seen this website a few times before but hadn't noticed that they finally had it translated to english too. Its basically a treasure trove for the DIY'er.
http://eshop.diyclub.biz/index.phpRemote control kits with input selection, dac kits with tube output stages, preamps, amps, cases, parts, etc. They also offer completed components like the DACs that are also offered by another AC retailer. It looks like their prices include shipping.
They have some 50w R-core tx's that many of hte UcD amp builders are using to seperately power the front end of the UcD modules (with obviously regulated supply). I ordered 4 myself to try out at $15 each and they didn't add any extra for shipping so I am assuming it is included.
They could potentially also make for small Felicia's, or maybe the larger ones would be better. They have some larger EI core tx's as well.