Ian is a Parts God on here and gets only genuine T parts at better than favorable prices.
Now, I understand the predicament that you are in, but my bearings went exactly the same way. Wading. They got more and more 'grindy' as time went on. But you know what, when I took them out, they weren't even close to exploding, seizing or anything nasty. My wife's Corolla went the same way and it took me a year to getting round to swapping the bearings. Again, barely a thing wrong with them. You probably won't need both bearings. It's generally the nose, or front bearing that goes. This is the one that takes the load, especially if the belts have been over tightened.
I'd get the part number off Toyo and ask Ian for a price. I tried all of the major bearing suppliers and no one had anything similar. They all said that it was common to have 'specials' in automotive parts like this and you'd never find one other than OEM.
Dead easy job to swap too. OK if someone will do the lot, both bearings inc VAT for £100, it's a close call money wise. I'd still do it myself.
C