Are any of these Through the Ages expansions actually in print yet?
Only the foreign versions. If you purchase the Polish and Czech editions, there are retailers who sell the actual cards with them. Otherwise, no. When I emailed Vlaada and CGE some time ago, they stated that the expansions were publisher specific and wouldn't be coming out.
Hopefully in the future they change their minds. It's not that hard though to substitute one card for another when it comes out in the deck with a paste up.