I guess I never even considered looking at a supply house. I figured wall plates should be easy to come by pretty much anywhere, for a reasonable price. I guess not. I checked the supply house we use and they can get all the plates I need for a reasonable price ($1.20 for 1G Decora). That's more like it and shows what highway robbery Amazon and the like are getting. Of course they're not in stock and I'll have to wait a week or so, but I'm in no rush.
Regarding those that say midway's shouldn't be required, bad carpentry, etc. Ya, you're right, and I guess you can call me a bad carpenter then. The wall covering is OSB and I'm pretty impressed I got the cut-outs as good as I did with about an 1/8" gap on most, one has probably 1/4". But even with 1/8" that puts the edge of a standard plate right on the edge of the cut-out. I don't like the looks of it or messing with it, so I'm using midways. You by-the-book guys can claim they shouldn't be used all you want, but in the real world, including my shop, there's always bigger gaps than a standard plate will cover.
Yours Truly,
****** Carpenter