Revolution is a GREAT flea product, although it's VERY pricey! I've had a ton of luck with it, though.
I know for sure that Pet Valu/Paulmacs sells a product called Zodiac Spot On which is a topical treatment like Revolution and it's very reasonably priced. I'm not sure how affective but I think it's pretty good.
Try some of the online places like PetEdge, JeffersPet, petMedsOnline...google "frontline" or whatever and see what comes up. Until you stop the life cycle of the flea on the animal you will never be rid of the flea. And soon they will be feeding on you and any other living thing in your home. We have small dogs and did very well with advantage.
I suggest you purchase a good, veterinary licensed flea preventative that works rather than some rubbish that does not, especially if you cannot afford to waste cash. Thorough combing with a fine tooth brush + spraying the house may be as effective as pet store flea products.