You could get regular bifocal glasses that are "clear" on the top portion, with only the rx you need in the bifocal portion. Then use them with clip-ons that you can flip up or down as needed, for sun. Or you might even find "readers" at one of the big box stores that has the bifocal you need, with non-rx top portion. They aren't wrap-around, but would work. And if you're set on wrap-around, could use them until you found a pair.