Brian, I'm curious, did you try the Hillside SPCA in Pottsville on the cost of spaying on the cats?
For anyone who takes in a stray and is not sure what to do, I suggest calling your local humane society or any other "animal groups" that may be listed in your area. If you're not sure who or what group is in your area or can't find information on them, try the local pet supply store (usually local groups will work with these stores for adoptions).
On that note with those who find cats or kittens, the first thing you should do is have them tested for feline luekemia/FIV (in a "nutshell" like human aids). Keep in mind feline luekemia is not harmful to humans, but can be deadly to other cats. If you have a litter of kittens, you only need to have one cat tested from the litter. If you handle a cat with feline leukemia, and then handle another cat who does not have the disease, you can transmit that disease to a non-affected cat. This disease is not pretty, and the most humane thing to do is if the cat tests positive is have it destroyed.
As far as the cost of spaying or neutering (sp?), if you already don't have a vet (or surprised by the vets prices), look in your area for a low cost spay/neuter clinic. These clinics exist just as thier name implies.
In our area, "off the street pricing" for anyone who walks in (appointments of course need to be made) are as follows
Dogs $65 spay/$55 neuter (if the dog weighs over 40lbs, add $10)
Cats $55 spay/ $45 neuter
You may also be able to get financial help from your local organization as well (which would bring the cost down even lower).
Keep in mind, the prices that I've listed are in my area. Your area may be different as well. I read here (I think Bird) that one going rate was $200. That does seem VERY high (but I also think this was from a "private" vet).
Genreal rule is that neutering is usually always lower in cost than spaying (procedure is "easier").
If you take in an abandoned animal and don't want to keep it, think about "fostering". You can get help for doing this by working with your local "animal" group. Keep in mind, I'm speaking in general, and I'm sure different parts of the U.S are different on how they (animal groups) handle this (fostering).
The dynamics of voleunteer (sp?) groups can be very interesting as well. Keep in mind, most people mean good. On that note, believe (sp?) me when I say working with the "general public" can be just as interesting (you would be surprised).