Topre does make a 108 and a 106 key keyboard but they are not imported to the US. If you are in the US drop EliteKeyoards a email and ask them to get you one (they will but you may have to wait a few months for it).
Realforce 106 - no longer in production but can still be had, It should also be noted that you can find this one on Yahoo Japan for a good price if you don't mind used.

Realforce 108U - Still in production and would be the one EliteKeyboards could get new, I don't see very many of these on Yahoo Japan.

Realforce 108UB (Black version):

Price for the 108U(B) should be about the same as the current one EliteKeyboards sales but may be a little more I'm not sure because I have not priced them in a while.
If you want tenkeyless then you would want the 91U(B) but they are more expensive and have more options.