Here in Poland, on auction service Allegro, you can buy stickerd for several audio and video editing software.
And - because my girlfriend is a graphician, print secialist and DTP operator, I can say few words about - how the stickers SHOULD be made:
- printing is simple - solvent plotter prints on self-adhesive foil
- next step is - putting safety foil on the prints (one side hot foiling)
- at last - cutting plotter cuts little button stickers
This gives you warranty, that the "result" will be long lasting, water/sun proof and as good as you design it.
It is also the best way to make custom faceplate stickers etc. The clue is, to make EPS, PDF, Corel, AI file (vector curves) with cutting lines for cutting plotter. That's the "most difficult" part of whole preparation process.
And - costs are as funny as low: For one square meter - up to 30$ here.