Not including the foundation that was poured when I originally built my house, I have ~$23,000 into it. I think the cost is pretty reasonable for the size.
I'm fortunate that I was able to do all the labor other than the concrete floor pour. I only had one person help when it came time to put up the trusses. He brought over his tractor and boom attachment. In hindsight, for the $ I paid him, I could have built a boom for my own tractor and set them on my own.
I lucked out in being able to use a local mill for the rough cut hemlock purlin material, the T&G pine siding, ordering the trusses, and supplying the metal roofing. The costs thru him were much lower than any other vendor I could find. I didn't want to use rough cut for the main structure, so I uses typical framing lumber almost exclusively thru Home Depot. They were again cheaper than any other small local vendor for that. Also, I could use my enclosed trailer to run up to NH and purchase it tax free. I even ordered my three garage doors thru HD when they had a 20% sale if ordered by the end of the year in 2013. Was also able to stack a 10% off coupon on top of that w/ no sales tax. Guess I'm a cheapskate.
No heat, insulation, or sheetrock at this point either, but they'll come in time.