I trap-neuter-release stray cats in my neighborhood and I would like to help.
Are you in Seminole County? I found a link to some info that may help. If this is not your county, look on this page for other counties that have low cost spay/neuter. It will really cut down the cost. They might even be able to lend traps so you can bring in more at once.
SEMINOLE COUNTY $10 spay / neuter for Feral, Free Roamers & Community CATS for residing in zip codes 32701, 32714, 32750 and 32779 Altamonte Springs, Florida & Longwood, Florida during the month of SEPT at SpayNSave (988 N. Ronald Reagan Blvd. Longwood FL 32750)(www.spaynsave.org) to make your appointment call 407-920-4894 $10 includes spay/neuter + rabies vaccine + distemper vaccine. LIMITED SPACES! Info as of NOV 2014
http://www.spayflorida.org/Feral_Cat-Resourses.html
If there are kittens, make sure they are old enough that mama can be away overnight. They won't spay a mom that's feeding until the babies are a little older, so check out information for that. If the kittens are over 12 weeks, they can be fixed as well. A lot of times, depending on the size of your trap, you will get two kittens at a time as they like to stick together. That should be fine (check with the vet if you can bring them in the same trap--my place is ok with it).
Here is some good info on trapping if you haven't done it before.
http://fixnation.org/wordpress/wp-content/uploads/2012/10/FixNation_Trap_Training_2012.pdf
Let me know what you find out. If you can get the cost of the fixing to be lower, I may be able to help you with the whole thing.