Does it have to be modern? Do you have switch requirements (cherry, topre, etc)? Do you want to buy it from a retailer?
If not, you could consider the IBM Model M Spacesaver (it's a TKL Model M). If this is for constant transport, I might not recommend the Spacesaver because of its weight and the plastic clips that hold the detachable cable in. If it is for occasional transport it might fit your needs.
You will have to get it from another person, so it might take some time to find the right price.