Is there a tank on property? Is in a rural area....my guess is that it is the oNLY option. I live in the country on a farm, grew up on a farm as well. There is NO natural gas even available out here. The cost is about the same.
I had bought a brand new mobile home in 2000 and put it on a rural property. It was made to take natuaral gas, and the company I bought the home from just basically had to add a peice to the line where it connected and all was good.
We have since bought a 2 story modular home (it was the model) and it came with all the appliances, etc. There was no need to change any of the appliances, they just hooked the "house" up to propane with the appropriate hardware.
One word of advice. If you have to get your tank filled, shop around to different companies for the best deal. Also many offer prepaid type deals in the summer for winter months, or some kind of lock in price. WE locked ours in this summer, and if we didn't we would be paying over $1 more per gallon right now.