Toshiba made some of the best Alps caps ever. I trawled eBay for T3100/T5200's for a long time but never found a deal like this. Damn.
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I managed to get my T3100 for $49 shipped last year. Since then, I've seen quite a few go around for cheaper. Just follow your eBay searches of them via email, and you might have a good chance.
The keycaps are great but mod compatibility is quite low. I'd love to get my hands on another set without the orange font. Here they are on my DCK-84: