The Skylanders Sidekicks were originally part of a Frito-Lay Promotion in the summer of 2012. It was a limited time, mail-in offer. In early 2013, they were available through GameStop as part of an exclusive promotion they were holding.
The Skylanders Giants Sidekicks are once again part of a Frito-Lay Promotion for the summer of 2013. This year you do not have to mail anything in. It is all done online. This is however a limited time offer.
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Skylanders Giants Sidekicks
Skylanders Spyro’s Adventure Sidekicks