I actually prefer the flat style, and if I'm understanding correctly they are the easiest to print face-down and without the layering.
Yes, they're not strictly authentic, but they look good with our rims, and I think most would assume they genuine.
Not only have I lost one, but the others are daggy and look difficult to repaint as they have delaminated.
NOS ones are becoming rarer. The cheapest I can find are twenty quid (about $40) plus postage from the UK.
Centre stickers should be no problem, I'm assuming these will suffice:
As for the colour, I don't mind painting, and for now will probably just make do with something generic from Bunnings, as I am contemplating recolouring the rims.