How much does it cost to take a rat to the vets?

how much will it cost to take my rat ercups to the vets? i would like to take her and see why she is making sounds. she only does it when she comes out with the male rats but she does not really do it when she comes out on her own with her cage mate destiny. i really like to know how much it cost it to take her to the vets. their bedding is not cheddar and pine it is care fresh.