Reconsider.
TurtleSale is a poor choice of company to buy from. They have some serious ethical issues (such as deliberately breeding disabled "no-eyed" sliders, throwing in baby red eared sliders with expensive orders, and shipping ill animals).
They're just in it for the money, please find another source.
http://www.turtlepimp.com is a more respectable place to buy turtles from, although they don't currently have a lot of stock in.
Supplies of baby turtles are always limited this early in the year. Buying baby turtles out of hatching season runs the risk of buying "freezer babies" - baby turtles which have been forced into hibernation in a refridgerator so that they are available all year round. They very rarely do well.
Paul