Hi All,New to Knights Forum, but long time Swiss Army Knife carrier.
Swiss Bianco has a few aftermarket options, ti and g10. The smooth ti version is a plus scale.http://www.swissbiancocanada.com/products.htm
Ebay...The largest source, hands down.Pressing on new scales requires nothing special.Removing scales and keep them usable requires to get them warm a bit. (Soak in hot but not boiling water) or use a hair dryer.
Directly from a Victorinox flagship store... About 1/3 the price of most scales I've seen sold on the net. Downside is you will not find any "special" coloured scales (say... translucent green etc...). I get some for free too because I go there so often.In terms of removing and putting the scales, they use a watch case opener tool for removal and a vice with felt pads for pressing the new scales onto knives. It's usually not necessary but it can help a lot when putting on wooden scales for example.
I'll second eBay. I've ordered more than once from a seller in Switzerland, and he has a lot of the special color scales, like the hunter green or semi-standard camo patterns (woodland and desert; no neon or the new navy camo).