I have alway had good luck on the dreaded E-Bay. I usually roam looking for somone that is getting rid of their extras/spares. Picked up some realy good lots for my own spares bin.
If you are into converting there are also other figures sets on E-Bay that can be found. Just type in "1/48 figure"
Also there is a German firm "Preiser" that has 1/48 or 1/50 figure sets. They are mainly for trains but they have some good Luftwaffe pilot sets. Again, I find then on E-bay (not that I love E-bay but they are handly for some things), but your local hobby shop that deals with trains should be able to order them in for you.
PJL
On the bench;
Converting a 74 gun Heller kit into HMS Sutherland; 1/200
Converting Bomb Ketch into HMS Harvey; 1/200
Cleaning up an Aifix lot of 54mm figures, for converting.