If you have plenty of patience, a sharp knife, a keen eye, and choose a 'sympathetic' font you can cut them yourself from sheet.
Although not a sensible choice for a rescue boat I used Hawian Punk.
But it did take quite a while to cut both sides.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club