You can go to Petsmart and the vet there will sell you Advantage, one dose, for $10. It works for a little over a month, if you can't afford the expensive multi-packs. They are worth it.
By the way, if you are the only one getting bitten, you may be allergic to flea bites like I am. An allergy to fleas makes you more prone to being bitten and it bothers you a lot more than others.