I picked up the Avia disk via Amazon because I happened to be out of town anyways when I first heard about calibration. I expect any place that sells lots of DVDs would have Avia... there are also a couple of other good setup DVDs but I don't remember the names, maybe Home Theater Essentials ?

The SPL meters come from Radio Shack; something like $40 US, I think. They have both analog and digital models... both have advantages but I went for the analog one. I find it easier to read but IIRC you have to switch ranges more often than with the digital.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8