try comfort inn lake buena vista. I just booked for my august trip and they do allow pets for an extra fee. It is a good location. Right down the street from downtown disney. I just booked the room for $54 AAA rate. I have a thread started asking about the hotel and one person responded that it is decent. And you get a free breakfast, probably just bagels and toast and such but every bit helps.
I was just coming to recommend this hotel. It generally gets great reviews around here. It is no frills-- but it's clean and modern- and easy on the budget.