There is a thread about hobby shops here .

My local hobby shop sells the "Official" Microsizers kits, and they average about six dollars US.
I noticed the online prices generally tend to not be great, and then there is shipping on top of that.

Even with some research finding competitive online pricing, the shipping charges favor making a larger purchase, so it's really a matter of what works best for you.

Spending 6 bucks at a time also works great for my budget.
As a matter of fact, I plan on picking up the blue and clear Skyline bodies this very afternoon.