Hi Gewehr and welcome to the forums. I must warn you that you ought not enter into buying Lugers lightly. Before you know it you'll be charging a 99% Erfurt Artillery on your CC and selling your kids to pay for it...
Seriously though, you can still pick them up for fairly cheap (sic). I just got a 1920 DWM commercial for $500. It's all matching but the finish is only about 60%.
But that's the cheapest one I've ever seen. I think I was able to get it because everyone and his brother has a 1920 commercial. It seems to be the single most populous Luger there is.
Enjoy whatever you buy. I hope you are able to resist the siren song of Georg's baby.....