Obtaining price/square foot on other comps could be answered better by those on this site that have ready access to such information (SD Realtor, sdrealtor, etc.). I am not saying to buy or not, but rather to do as much research as you can in the time frame that you are given. Then, no matter what decision you make, you’ll be able to more easily sleep at night knowing that you did all that you could in the best interests of your family.