I've got a Ramsey TVT-1, which I guess must be one of Ramsey's early versions of this kit. [And yes, transmitting TV shows to my old TVs was indeed the application I had in mind with it!
] It wasn't very expensive-- I think it was about $12 or $13 (in kit form, without the plastic cabinet which was an optional extra at the time) when I got it over ten years ago. It's a fun li'l device for twelve bucks, but quality-wise I'd rate it as rather mediocre, which is especially apparent when using it with a color TV. The kit shown in that eBay auction appears to have a significantly more complex circuit than mine, so
hopefully this indicates that it's improved considerably over the old TVT-1.
It's also more expensive than the old TVT-1, as far as that goes-- looking at Ramsey's web site, the TVT-6C is the current version, and it's available for $39.95 direct from them (same price as the one in that eBay auction). At least now they throw in the the matching plastic cabinet in the basic price of the kit though.
http://www.ramseyelectronics.com/cgi...ction&key=TV6C
Ramsey kits are available from various amateur radio and electronics dealers as well, so you might find it slightly cheaper (or more locally) elsewhere.
There are certainly other products out there besides the Ramsey kits, I might add; I found a few by Googe-ing for "VHF TV transmitter low-power", including products ranging from other no-license <= 100mW kits up to LPTV transmitters. ...Which makes me wonder if the FCC would even continue to issue LPTV licenses once analog TV goes off the air.