If it's something you think you'll need on a regular basis, let me know, I use a fair amount of glass backed. I've just ordered a box each of Silica Gel H w/ 1% Potassium 0xalate 250 um 10x20cm, the non-scored Avicel microcrystalline cellulose 250 um 10x20cm, and some Reverse Phase HPTLC-RPS Impregnated 150 um 10x20cm.I could split off as many as you like from a case, and I'd let 'em go at cost + postage - and I get 30% off list, so that's a pretty good deal. If you'd like a whole box, I could throw one on my next order and get you the same 30% off list.