Just discovered FlyerTalk, figured I'd share my Rimowa secrets!
I purchased 2 Rimowa bags from therealreal.com. It's a second hand site but they are very clear about the condition of the item - not all bags are in perfect condition, but it's noted in the product description. The ones I purchased were in excellent condition - I got the small carry-on for around $500, it had 1 scuff mark but at the price I thought it was more than fair . You have to sign up to view what Rimowa options they have, but it takes 2 seconds and it's free. The prices are great and the selection changes all the time (I checked it every now and again for 2 months or so before committing).