Each option DOES have a price, but the price is fairly meaningless. It just raises invoice price to the dealer. They then use their own markup strategy to actually price the camper on the lot. Not much different from car dealers, but it seems that RV's come to the lot a good bit cheaper than the MSRP so they can fudge a lot more. Kinda like going to a jeweler to get "70% OFF" when they overinflated the value from the start. They are probably still making a good profit at the reduced price, or else they wouldn't be in business long. They just make a lot more money of those who buy early, don't shop around, or can afford not to care what they paid.
TV: '06 Ram 1500 SLT QCSB Hemi 4x4
TT: '12 Grey Wolf 27BHKS
Tow Acc: Tekonsha P3 BC, Curt round bar WDH w/sway control, CIPA custom fit tow mirrors