Many of us don't have the budget for expensive invitations for our upcoming simchas. However, that doesn't mean you can't produce a beautiful invitation inexpensively! Here are some FREE downloads from Weddingchicks.com that would work beautifully for a Bat Mitzvah invitation:

Butterfly Invitation Suite:

Damask Invitations

For printing, you can either print them at home or bring them to a place like Kinko's or Office Depot.... They can also cut them for you (I bring my work to Kinko's for cutting--it costs next to nothing and the edges look so much cleaner!).

 If you need nice typefaces for these invitations, visit Dafont.com for tons of great free font downloads!