If you live in Chicago, check out this post on "The Cat's Meow" for low-cost vet services and free pet food.
For coupon deals and other savings, click here for the "Pet Coupon$ & Deal$" site. You can search the cat section for specific categories, or browse all the current deals. The site is run by Anders, aka "Snuzzy", from Catster/Dogster. There is even a search for free stuff, including an engraved metal tag from the Humane Society of Canada that has a pet recovery system.
I am adding the "Pet Coupon$ & Deal$" site to my blogroll so the latest deal there will always be featured in the sidebar here. Be sure to check it out when you visit.