TexasCHLforum.com

Collectors Firearms used to offer that service. Don't know if they still do it or not, it's been a while since I actually purchased a firearm from that store.

And j1132s made good points. The guns are all current production and can be ordered at any time. So unless you are getting a significant discount and you need to lock in the price, save your pennies in the bank and earn interest on them yourself rather than letting the dealer get a interest free loan out of you.