singeronline best choice, worldwide shipping
sewingpartsonline good too also, worldwide shipping
you can search by model, you can try amazon once you know what the part number is.
in switzerland you will find bernina dealers mostly, skip the manor, low selection and high price
there is a physical store for singer in nice france in case your ever there.

Hello, Manor in the sewing department and Singer retailers sell the accessories, which are standard to the brand.
Have a nice day Michaela