I just recently went through the same experience of trying to find an affordable tapeworm med. I found this website to be a savior. Check out payless-petproducts.com. They sell a product called "Fishtapes". You can use it on your dogs and cats which I love. They also accept paypal and ship very fast. I am a new loyal customer
They sell all kinds of antibiotics as too which is totally awesome! Well hope this helps.
Chef
Chef