I have gotten several off of the auction site. Prices fluctuate wildly, but I have gotten a real Rollei lenshade with its leather case for a low-price of $12 and a high of $35. If it's the BayI lens the Yashica lens shades work just fine as well. I wish I had a spare so I could play "Let's Make A Deal" for you - I price things to move - but no such luck. I've found that patience can often reward you if you have the time to wait.

Good Luck!