Amazon has a bunch of HD-DVDs and Blu-Rays for under $20.
Or at least they used to.
http://www.highdefdigest.com/ has some price trackers as well as reviews.
As for the Total HD disc, I don't think Warners is going to get a lot of takers.
They basically have to convince other studios, their competitors, to use a format which makes the discs more expensive to make and pays patent license fees to Warners.
Right now, there are only two studios publishing for both formats, Warners and Paramount. Warners is hoping Disney and Fox will publish for both instead of just Blu-Ray and use this Total HD disc.
There are other attempts to draw more studios to the HD-DVD side. Right before E3, Toshiba said they might be able to boost the capacity from 30 GB to 45 GB. None of the Blu-Ray studios bit. Toshiba never submitted this new spec. to formally put into their format.
Now at CES, Toshiba is saying they could actually boost capacity to 51 GB, bettering Blu-Ray by 1 GB. So far, no takers.