It's possible that's an option that your local dealer doesn't order. If you really want it, ask your dealer if he'll do a custom order for you and see if you can get that option picked.
If he's giving you a break by buying off the lot, I'd probably just go with one that has basic wall mounted thermostat (i.e. not directly on the unit) and then swap it with a programmable one from Lowes or Home Depot or something. I believe most are compatible unless you're starting with the Dometic digital one.
There's no use crying over spilled milk, unless it's on your keyboard.