Ha! Sometimes you get lucky when you aren't even trying to. I was in Scotch Paints in Gardena, buying some Draw Tite, and they had a bucket with old seam rollers and such. There were several Nylon beveled corner rollers like I use, only they were the older kind with the fatter handles. I REALLY liked those when I could get them. They looked over 10 years old, maybe 20 based on the stuff they were grouped with. But they were still attached to the paper packaging, never seeing use. I got them (4, left a couple behind) for about $3 each.
I've seen this thread for a couple weeks now, and I never knew what a Warner #230 was. So I went out to my truck and looked, and sure enough, based on the picture online at Spectra Paints (paintstoreonline), they're #230's. Hurry up and call Scotch Paints in Gardena, as they might still have a few.