I own a Furniture Medic franchise in Colorado. I stock and replace spring clips, as do many other Furniture Medic franchises around the country. Clips can sometimes be purchased from upholstery shops. The problem is not so much the clip, but the fact that manufacturers started using staples to apply them, instead of screws. I also do mechanism replacements, as well as mechanism repairs when replacements are no longer available. If I can get a replacement mechanism under warranty, I will do so, and simply charge the labor. Many furniture manufacturers and retailers recommend Furniture Medic for such repairs. Just go to www.furnituremedic.com, and search for your nearest Furniture Medic.
Furniture Medic by Randy Buchter, January 2012