there is a german print-service which also provides uv-active posters. www.flyeralarm.de I payed for 500 posters 94 euro (porto inc.) this makes 18 ct per print. this were normal colors, but the uv-prints are not so much more expensive. the paper was relatively thin, but the colors were good. (i don`t know if i have chosen the thickest paper, they offer different colors, sizes and paper-qualities) perhaps this information is interesting for you. good luck, i love your work.