While amazon had 5 of the ones i needed for 7.99 (best price so far)
toys r us online offers them for 9.99 or 24$
Gamestop also 9.99 and this morning they have a good selection.
Did you know best buy carries them also?? Went to best buy and they were very well stocked (Selma, TX). Although their online selection is poor!
Walmart has the online option for emails if the item becomes available..
I haven't had any luck with Target so far---
I am missing only six that includes Ligtning rod, Zook, Camo, Ignitor, Wham bam, Warnado (sorry about spelling don't have them in-front of me.
My son is absolutely wowed with the game and I will continue only to spend what I have to (not over priced items) ..
Good luck on your search!