Contagious cats

We have 3 tabbies ...well 2 tabbies (1 male, 1 female) and a medium hair....cat w/tabby in it (also male). so 2 males 1 female

We had our female spayed at the humane society and she came back, was really low energy (completely different from her usual self, but she just was spayed so we thouhgt it normal).
anyway she starts sneezing and wont eat. She just finds the warmest spots in the house and rests. Now she sounds like she's coughing and sneezing. Her breath smells bad and and she really sprays stuff when she sneezes.
The other cats are starting the same way as well, we think they got it from our female.
So we think it is upper respritorry infection, we can't afford the vet, but we might have to afford it. I'm just wondering if we should just let them work it out and just feed them some wet food (they'll eat that no matter what).

i just don't know what to do. any advice would be appreciated.

Well, i found the thing on the uri in the health thing, thats helping out.

Hi there. Bravo for getting your cat spayed. Does the Humane Society where you got her spayed have a low-cost veterinary clinic? If they don't, call them or try Go0gling to see if there is one near you, so that you can take the cats to a vet. URIs aren't fun, but they're fairly easy to clear up with vet care, as long as you take care of it as soon as possible. My vet (which is not a low-cost clinic) gives me a discount when I bring in two or more cats at a time. If you can't find a clinic, call around a talk to some vets, to see what kind of deals they might be able to make. Maybe a payment plan of some kind?

You need to take them in, though. URIs are easily passed around. My vet says that cats don't cough very often, so if she's really coughing, you need to take them in right away. Good luck, and let us know what happened.