I already got my backup 350s long ago. I purchased a 2nd new silver one when the T1s came out, I was that disappointed in the T1s.
And when I found a couple of used navy blue 350s that I managed to get, I also got 2 more silver used readers extremely cheap just to have spare parts, like $35 each. And it was a good thing I did, one of the blue ones had a really badly damaged screen... not only scratches but an actual gouge on the glass. I'm surprised whatever caused it didn't break the screen, but it still worked perfectly.
I keep my readers in pristine condition with covers, so the scratches alone bugged me, but that gouge had to go and I swapped one of the cheap used silver screens and put it into the blue shell, so it's like new.
So yeah, I've got my backups!