I buy the movie and the Rifftrax usually within 24 hours of the release. I like to own the movie so's I can watch the rifftrax anytime I want for the foreseeable future.
BTW, I love, love, LOVE the fact that the new website, (well, kind of new by now it's been around since the Holidays, I guess...) remembers all of my pertinent info for ordering Rifftrax and whatever else. That is so cool that I don't have to keep re-entering my debit card info... thank you TorgosPizza!!!