I recently bought about 19 whetstones from eBay. It came with the following:
kumagoro 4K 6k 8k grit
Naniwa 1k 2k 3k 5k
Nubatoma 1k 2k 4K
Kitayama 12k (although it looks just like the 8k)
Shapton 1500 and 8k
Norton 8k
An unknown 10k grit blue stone
An unknown grit Suehiro stone on a...