You'll probably find the same price increase for everything that you'd want to comfortably use for a house.

One possibility is see if there is any house mover type places around that have something. From time to time you see free houses advertised that are being moved off a lot to make room for a newer house. The house is free but you have to pay for all the fees involved with moving it and get the foundation made and deal with repairs from being moved but at the end of the day the prices for that shouldn't have gone up as much as building something new because the house is already built. Or look at buying a trailer park type trailer to use until what you want to build is affordable again. Then use the trailer as extra room or sell it.