I own VetterBrew HomeBrew in Clearwater on 580. We charge $15. Pretty standard charge. If your cylinder is not ice cold you will not get anywhere near 5 lbs of co2 in it. B21 takes them in the back and fills them. You have no idea how much you got. You can weigh the cylinder and subtract the Tare Weight (TW=7.6) stamped on the tank. We like to freeze them first then fill them. Cheers!