Known for international shipping, Jackson's Art Supplies carries Toyobo Printight plates. Their 0.95mm thickness is recommended for relief/letterpress ( $38 for A3), while 0.73mm is best for intaglio ( $69 for A2).
Toyobo : Printight Photopolymer Solar Plate : 0.95mm Thickness : A3 where to buy photopolymer plates
Photopolymer plates (often called "solar plates") are essential for high-detail printmaking, letterpress, and stamp making. You can purchase them as if you have your own UV exposure unit, or order custom-finished plates from service bureaus that process your digital or analog artwork for you. Retailers for Unexposed Plates You can purchase them as if you have
These suppliers are ideal for artists and printmakers who want to process their own plates using sunlight or a UV light box. They charge roughly with a minimum order of 35 square inches
A reliable Canadian source that processes KF95 plates. They charge roughly with a minimum order of 35 square inches. Screen printing supply store ClosedL'Hospitalet de Llobregat, Spain
Blick Art Materials primarily stocks Akua clear PETG plates, which are ideal for use with photopolymer films and monotypes. Prices range from roughly $8 for a 3-pack to $91 for large bulk sets.
A specialist in fine art printmaking, Takach Press stocks Toyobo steel-backed plates. They offer varying sizes, from small 5.75" x 8.25" sheets starting at $10 to large 23.375" x 33" plates for $134 .