These questions were probably answered in the TV Edition Intro thread, but it is no more. Are the fulfillments regular CH dvds and/or box sets, or just other box sets? Are fulfillment prices the same as those for regular CH accounts?

You can fulfill with any DVD 19.95 or up, it doesn't matter whether it's a box set or not. As far as I am aware, fulfillment prices are the same.

^Yes, the list of DVDs and prices is the same for both the regular and TV Edition clubs. Sale offers can vary but they are usually similar as well. BOGOF codes usually work on TV Edtion accounts if they generally work on regular DVD club accounts.