The winter trigger guard model was available from SAMCO for a long time. Many, if not all of these were manufactured post war by the Czechs. A large number of Czech Mausers ended up in the hands of the Israelis. The Czechs were one of the few countries that would sell to the Israelis, but it was cash and carry only. Later, the Israelis rebarreled their Mausers to 7.62 NATO.
These are good rifles.
Another source for K98ks is Yugoslavia. The Yugos build rifles on ex-German Model 98 receivers. Often these can be found in great shape, all matching numbers with an excellent bore. A very similar rifle is the Yugo Model 24/52. These are build on 1920s era Czech standard length Mauser actions. These too can be found in great condition.
While the Model 98s were German, you might want to consider an FN Mauser. There are many carbine length FN pattern Mauser action rifles. Keep in mind that the FN is an intermediate length action, i.e., slightly shorter action than the MOD98. These are available as Yugo M48, M48A, M24/47, and the M48BO. The first three are generally less expensive than the BO based on the lower production numbers of the BO. The only differences in these are relatively minor.
Regardless which Mauser carbine you get, I strongly suggest a PAST or some sort of substantial recoil protection. While we guys are all macho and can take brutal recoil, you will live to regret not protecting yourself when you get older and your joints begin to remind you of every liberty you took with them.
Have fun and make sure you adequately clean your rifles when done for the day.