Well, most sellers would consider that you have a nearly 50% development rate to be pretty good. Some try for more (I'd love for my buyers to consistently get 75%), others frequently get less. Hatching shipped eggs is risky - even hardy, fertile eggs can be damaged quickly by being shaken...
Updated 12/25 - TWO MORE SHIPMENT LEFT FOR THIS SALE!
Here's the last sale for 2012 - all shipments set to go out from 24-31Dec2012 will be $30 + $12 shipping (for a total of $42).
These will go up to $48 in the new year, but...right now they're on sale! Through December, they are...