Entertainment Earth looks like its the first e-retailer to take preorders for Marvel Attacktix. They are showing the Ghost Rider Starter Set and the Spider-Man Origins Starter Set.
Previously, SDCC described the Spider-Man Starter Set as a Wal-Mart exclusive. However, this may only pertain to brick and mortar stores, and all online stores may carry it.
No matter how you look at it, the good news is Hasbro has released images of the Origins Starter and the Spider-Armor Spider-Man looks incredible!
Marvel Attacktix - Spider-Man Origins Starter Set