One of the cheaper ones is comodo instantssl I think... $99/yr for 1 year, down to $65/yr for a 5-year cert.
It's just asinine to pay for a cert for TFL when hardly anyone would use it. The whole SSL thing was supposed to be optional for people who know they want it, know what the security implications are, and know enough to check if TFL supports it... (as you point out, most people won't even know about it unless they try it or get hijacked into using it because of silly search indexes and/or silly people linking to tfl with
https://).
Chuck, thanks for the input, but we don't want Googlebot to get confused. We just want it indexing http:// pages rather than https://