Omrick,
Puddlejumper is correct that the Alps printers are the only ones I know of which will print white or the metallics (gold and silver). It uses thermal transfer instead of inkjet I believe. I have one and it does work, but they are no longer made or supported by Alps. I found mine on eBay, but many of the ones offered on ebay are not functioning and offered for parts supply. They usually do not come with a manual, tape cartridges (not ink), or computer driver. They probably run $100 to $200 I would guess. Also the driver that came with my Windows XP works with the Alps basic functions, but does not include the white/metallic options so I had to hunt down separate a driver before the white functions would work for me. Also, if you find one, they use the blue laserjet paper that Micro Mark offers, not the regular inkjet decal paper. Normal inkjet produced decals have to coated with a clear spray to prevent the ink from running when you put them in water, but the Alps decals do not. Micro Mark has some info on that issue on their website.
Hope that helps. Keep flying with the eagles!
Mentor63