There are 2 types of rabbit strips: Crosscut & straight-cut (AKA "zonker strips"). Zonkers come in 2 sizes: Standard & magnum. Magnums are wider.
It's more economical to buy fur scraps & cut them yourself. Just turn it skin-side up, clamp it in something or have someone hold it tight, then slice using something very sharp. I use an Xacto knife. (Note: scissors do NOT work well for this.)
Hilltop sells nice bags of fur scraps for $4.19/bag. I've bought 3 of them so far! The only disadvantage is that the colors vary. Buying scraps is like a box of chocolates -- ya never know what you're going to get. Here's a link: RABBIT HIDE PIECES VARIETY PACK FLY TYING FISHING FLIES - eBay (item 390026780491 end time Feb-01-09 18:09:13 PST)
This is currently my favorite crappie jig, and it's made with a chartreuse zonker + white marabou. (1/16 oz pearl white head, #4 Matzuo sickle hook)