In addition to buying Rimowa at the airport, can anyone recommend a good dealer for Rimowa in Frankfurt itself?

Am looking for these two models and they don't show up on the LH Worldshop inventory, as far as I can see:
1) Rimowa Salsa Cabin Trolley Multiwheel 56
http://www.rimowa.com/en-us/salsa-ca...se/810.56.32.4
2) Rimowa Bolero Multiwheel Cabin Trolley 56
http://www.rimowa.com/en-us/bolero-c...se/865.56.32.4

I dont expect these to be found airside at frankfurt, as they are slightly larger than Lufhansa carry-one size, but are carry-on-able on some other airlines.

Its a bit of a last-minute thing, and therefore cant really order these ahead of time, so if there is someplace that one can pick them up in-store in Frankfurt or at airport, that would be ideal.