Of the two I went to:
One store had about 10 of them (only Vader ESB, Luke ANH, and Vader ROTS)
The other store had almost 30 of them and had all the ones I've bought. I was really hoping I'd run into an Obi-wan gold =(
I have one more store to check tommorrow here though so who knows!
I figure most MR fans are probably not checking these stores so we have a good chance to get some!