Not exactly a 'buy' but a 'bought', mid 90's from the electronic surplus pile at Princess Auto
Used it for a while when I was learning computers, as the split seemed to help with typing. Didn't really like the clacky keys, got a 'nice' Microsoft one and kept this as a backup all through university. Been in a box in the basement for years, need to get this on Ebay before I totally forget and throw it out by mistake
Would be a shame as it turns out these can be fairly sought after