U-HANDBAG is based in the UK and has been recommended to me by several people. They have a selection of frames including internal frames, double frames and this very pretty clutch-bag frame with rhinestone clasp. It has hide-away loops for an optional chain which you can also buy from U-HANDBAG. http://www.u-handbag.com/index.php?main_page=define_main_page

LACIS are the only company that I have found so far who sell traditional Lucite purse frames. They also sell a range of metal frames, Lucite handles and other bag making accessories. http://www.lacis.com/catalog/data/AE_PurseFramesRetroLucite.html