I have several Rollei Bay III Color Conversion filters for sale. These filters fit the Rolleiflex f/2.8 models with the Planar or Xenotar lens. Each comes with its own original Rollei leather case and box. All of the filters and leather cases are in excellent condition. The boxes are in very good shape, but they do show superficial damage where a price tag may have been torn off.
Here's what I have:
Each filter is $25, with shipping to the USA included, along with a donation to APUG. Payment by PayPal is preferred; I will send you an invoice (i.e. Gift payment not required).