I've been ordering portfolios, custom cases and supplies from Portoliobox for I don't know how long, probably thirty years or so. They are based in Warren, RI and Stuart Einhorn who runs things there is the best: responsive, creative and with his long experience in dealing with artists, a real pro. Let's be honest, working with artists can be challenging, I know. I am one. This is, quite simply, an excellent company.
Want a 25 x 17 inch portfolio and can't find it anywhere? Call Stuart.Want a case for your upcoming limited edition portfolio? Call Stuart. Want a purple slipcase for your new book? Want an overlap folio in 24 x 30 inches? How about something special for those that gave at a high level to the Kickstarter campaign for your new book? Call Stuart.
Is this cheap stuff, banged off in Asia by the thousands? No way. This is local expert craftspeople making custom cases and folios to your specific specifications.
Portfoliobox was recently sold to a bigger company called Taylor Box Company. No matter. Have no fear, Portfoliobox is there.