I got my current shoes a year ago and have been running off and on ever since. They're great for my over-pronating self, but.... I've lost 40 (almost 50 now) pounds since I first got them. Some of that weight came off in my feet. I now have to tighten my shoes so that they will stay on while I'm running, but yesterday I got a blister in between my toe and my arch. I don't have the money to buy a new pair of shoes and there's probably only 50 miles on them. Any suggestions on how to fix the blister issue?
Thicker socks might help - I've known people to wear two pair of socks. Thicker/aftermarket insoles could also help but you have to spend a little there (less than shoes but still not free). Also there are a variety of lacing techniques that address various problems. Google lacing running shoes and browse the results for anything that might help.