Most good model shops should have that in stock, you can get 2 different types, inkjet or lazer. You might find more luck in a model railway shop or a boat specialist as the car / helicopter people aren't so interested. It would be expensive but SPOT ON are the best waterslide people I know, they'll make them to order but you'd end up paying a lot due to set up fee's. Other people do it, usually advertise on model railway forums and mags, I contacted some private people advertising they did it but found there service unreliable.
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