I'm not sure if you are looking for new or used bats.
As far as new bats, by far the best deals you can get are from a user CoreSoftball20. Look up his username and send him a private message. He generally deals with high-end bats, so I have no idea if he can help you or not, but if he can help you, you will get an amazing deal.
Really just looking for ideas out there for about $100. Seen posts on the CF6 Sprite before but can't ever find any in good shape at a good price! Lol.
DD used a Miken Halo Light for a year and she liked it, but it lost it's pop fairly quickly (couple thousand hits). When we started shopping for bats recently we almost got her a Boombah Tsunami. I still might get her one for a cage bat. I have no idea how good of a bat it is, but if it's on par with a Demarini Vendetta it's not a bad deal for $89. All three of these are actually under or around $100. If you catch a good sale you can pick up a top tier bat that is last years model for not much more than what you are wanting to spend. I think I paid about $180 for her LXT.
You should be able to find very good used bats on Ebay or Play It Again Sports for $100 or less. I know everyone likes new bats, but two weeks after your DD starts using it they all look the same....
Ditto on the Combat brands... the name hasn't made it to streamline fastpitch enthusiasts yet, it's mostly in the slowpitch market, so the prices are low....but bat quality is very good.