Looking for some advice on Bike Repair/Rental in Dayton/Nasty Nati

Today I was out cruising on my bike, warming up to do some hill climbs when all of a sudden I hear a
"Kerplang" sound. I stop and check the tire, seems okay. I start again and the bike handling is funky. I stop again and do a more thorough investigation and find that I have a broken spoke.

I call K&G Bike Shop in Centerville and they can't guarantee that they can fix it by Sunday, which sucks because I'm doing Tri for Joe on Sunday. Tomorrow morning I'm going to call around (most shops were closed by the time I got back from the ride at 7:30), but does anyone know of a repair shop in the Dayton/Cincy area that has a fast turnaround time?

Also, assuming I can't get it fixed in time, anyone know of a place that rents road/tri bikes? Or even just wheels?

Man I hope I figure something out. Worst case scenario, if you're doing Tri for Joe I'll be the guy on the too small 16 year old Mountain Bike you just blew past.