Zhu Zhu Pet shopper's guide

Robo hamsters freak out and become all the rage.

No doubt young adults are in the mix too.

The elusive and rare, freaked out robo hamster Zhu Zhu Pets faux hamsters showed up at major retailers on Sunday and disappeared from most shelves before the morning ended. Such is the life of the hot toy of the year -- following the likes of Furby and Tickle Me Elmo in the annals of toys whose scarcity was part of their allure.Zhu Zhu mania is bordering on the absurd -- creating a secondary market where the tantalizingly inexpensive toys ($8 at Walmart) become, well, expensive toys ($35.88 for one and $98 for a three-pack on Amazon.com).When the shipments came in this past weekend at some Walmart stores and were spotted on shelves, customers were denied the right to purchase them at the register. The sales were blocked.