How much could I expect to pay for a Bradford White Propane Water heater (approx 50 gallon)?

Got estimate from our "guy" and just want to get input from any contractors or anyone who has replaced their water heater recently with a Bradford White. We currently have a 48 gallon and he would be replacing it with that (or 50 gallon I guess; not sure if they only make 48 instead of 50). It's a propane water heater. Want to see what we could expect to pay for the tank itself. And would this be a good brand to go with versus the ones you can get at retail stores?