Cost of a ruptured anal gland?

I'm taking my poor little dog to the vet tomorrow, but luckily I'll be using a discount vet referral service in my area to provide me with the cheapest service possible since I'm short on cash. I think she has a ruptured anal gland. To make sure I get the best discount, what does it usually cost to fix a ruptured anal gland in a dog? I want to see how much of a discount I get when the discount vet place gives me a referral and cost.