If you're still looking for Dungeon 41, maybe you could see if Game Plus has it in their extensive archives (most back issues of Dragon and Dungeon) for sale. Maybe they could overnight deliver it to you.
http://www.games-plus.com
Call them up tomorrow when they open at 10 am central. The phone number is at the bottom of the page. Use one of those 10-10-220 (or whatever so it only costs a buck if you keep it under 20 minutes) services and ask right away for them to check if the issue is in their bins and how much it is. UPS overnight for a magazine can't be too much money, I suspect. I suppose it sounds like a lot but considering the situation it is one way out and you'd have the magazine by Thursday. Good luck.