It's hard to say from here but what would concern me is that if you go the 'cheap' route:
1) ANY 'eye' will see your current problem with the walls, question it, and figure the 'fix' is a cheap one. 2) From here, it's hard to say what you should do. BUT, no matter if you're staying in the house for 10 more years, or not, fixing the CAUSE of the problem is the FIRST priority; Fixing the 'damage that was done' is the 2nd priority. 3) IF the cause is the result of hydrostatic pressure, ie., water 'pushing' on the outside wall, perhaps a structural engineer would be best to 'bring in' to assess the damage. (Maybe you already know the cause.) Once the cause is known, the PROPER and SAFE fix can be made.
As for being 'stuck cost-wise' due to business booming, depending on what's happening to the wall, you may be able to do some of the inside OR OUTSIDE work yourself. You can talk to any and all contractors and engineers you hire to see if there's anything YOU can do to help alleviate the cost. Clean-up, for example, may save you $250. (Then, getting rid of whatever they leave around would be your responsibility.)
And lastly, you don't want to skimp on this type of repair. IF you do, you may be sending the wrong message to the prospective buyer. And that message is: If you skimp here, maybe you've skimped elsewhere. And who wants to inherit/buy THAT type of house. If the fix shows a quality and professional and sound 'result', that will tell a potential buyer that you don't take short-cuts and were willing to spend the $$$ to get the job done right. And DON'T try to 'hide' the damage OR the fix. You're better off explaining the problem to your realtor IN ADVANCE because, well, the question WILL come up from the house hunters. It may be good to leave around some 'documentation' explaining the fix because if an 'outside' realtor shows your home, they won't necessarily know what's up.
Your home is going to 'speak' for you. Talk to the realtor and see how much $$$ the RIGHT fix will add to your asking price. You may recoup half of the expense, possibly 3/4ths, possibly more in the sale. Like painting or repairing a broken door knob, unfortunately, this is one of those 'things' that would be considered maintenance and not necessarily an 'improvement' to the home. With that, don't get your hopes up too much. The key here is to present your home in the right 'light', and to sell it as quickly as possible for as much money as you can.