"Concrete prices are very high and going up." Urban legend. Here in DFW, a cubic yard is $88, if you buy more than 9 cubic yards. http://www.cooperconcrete.com/products.htm It's been at this price for more than a year. Given the groaning and moaning in the construction business lately, I expect it to go down. Less demand = lower prices.

Horizontal cracks like the one you describe are definitely a sign of bowing walls. This problem can be caused by a combination of poor foundation drainage and soil composition. Clay soils are known to cause this problem because they expand when wet and shrink when dry. The good news is that there are technologies out there that can improve drainage without having to dig out the foundation and install new french drains. There are also many options to stabilize bowing walls or return them to their original position, ranging from wall anchors, helical anchors, I-Beams, wall braces, carbon-reinforced strips, etc... all of which are less disruptive and more affordable than rebuilding a foundation. Here's an idea. Many reputable foundation repair companies offer free inspections and written estimates, and if they are have been in business for a while, they also have some experience inspecting foundations for real estate transaction purposes. I suggest you call a few of them, have at least one perform a professional inspection and give you a written estimate. With that written estimate you can then decide what you want to do. Walk away, negotiate down or ask the owner to fix. Consider that the house will have to be fixed at some point. I believe the current owner will have to do it if he wants to sell the house. Banks usually frown upon issuing loans to buy properties that have serious structural issues -- even if you are willing to buy it "as is" with a substantial discount. But since you really like the house, it is a good idea to get an expert opinion, know exactly how serious the problem is and how much it will cost to fix it, since it won't cost you nothing to find out. Hope this helps.

I have the same exact issue I just bought this house, and there is dirt black moisture dirt. soil underneath the bathtub but mice can come in through my wall there’s instillation around bathtub. and I have really really bad aunts every single morning in my bathroom which is on the opposite side of that wall. what can I do to fix this I do not want ants in my house for the next 30 years I can’t deal every single morning I got like 50 aunts in my sink next to the floor that’s just not going away.

Pretty common round these parts. Nothing usual in many other places either. Drying out depends on soil moisture under the slab.