Do you mean a presser foot to sew rolled hem or shell hem edges?
If so, the Bernina website lists the accessories here:http://www.bernina.com.au/product_detail-n25-i61-sEN.html
Bernina feet 68 and 69 are rolled hem/shell, just different widths. However, I think the feet for the Activa are the new 3 digit numbered feet? I know there is the old style and new style attachment system for Bernina feet, if you look at the presser feet you got with the machine, they will have a code on the front of the foot; buy any new feet with same code format.
As to where to buy, I always start with the manufacturer/distributor in my country first. So start with
www.bernina.com, go to your country, then "contact us" page and give the local office a call. They should be able to confirm the exact foot code you need and sell it to you or direct you to a local dealer who can.
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