why are some of these kong products different prices from other products?

why are some of these kong products different prices from other products?

x203 x203
Kong the realistic
Related to: 
Is it because of different sizes or something? I know one vibrates. Just being curious about the price difference. type in kong in the search bar and three of these come up
03/08/2012
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Rin (aka Nire) Rin (aka Nire)
Looks like there's some size variation, if you look at the toys' specs. Vibrating toys typically cost more, as well.
03/08/2012
Sammi Sammi
They're all different. This one is Vac-U-Lock compatible, this one has a suction cup base, and this one has a suction cup base and vibrates.
03/08/2012
Total posts: 3
Unique posters: 3