If you have Lego fans at home, you might want to check out these adorable Superheroes building blocks. Each set comes with 4 mini figures compatible with Legos including the hard to find Girl superheroes!
Choose from several different collections and each set is $8.99. Shipping adds $3.99- so your total should be $12.98. That works out to $3.24 per mini figure.
The Lego Store has mini figures for slightly more not including shipping and I have seen them for several dollars more on Amazon. This seems like a good price if you are looking for something different or those hard to find superheroes.