I have to think you have some good electronics stores in Dayton. Not the Radio Shack types, they're worthless... but a real electronics store.
Probably the best of all is a place called Midwest Electronics Surplus. I almost always find treasure there. I could spend hours browsing.
But being surplus, their stock on wire is inconsistent, and on some jobs I need consistency.
I ended up at a local place called Beckers Electric. Big supply house apparently servicing many of the local electricians. They did very well by me. In fact, they screwed up and gave me
double the length of wire I ordered and didn't charge me for it. When I called and told them their mistake, they said "keep it... Merry Christmas". They'll get my wire business from now on, and my recommendation to anyone who asks me where to buy wire.
At the risk of getting off topic here, I am generally disappointed in the availability of shop supplies here in the Dayton area. There aren't any really good tool shops, and it took me a long time to find a metals supplier. The metal supplier I did find deals mostly in structural steel for construction, so their selection of alloys and other metals seems to be limited.
Even things like paint shops are hard to find. I still haven't found an automotive paint shop that will mix a spray can for me based on the paint codes on my vehicles.
The vast majority of the shop equipment I buy comes from online sources. That's fine, except that some companies eat you alive on shipping. If there were a local McMaster-Carr warehouse I think I'd take a sleeping bag and move in there.
Ryan