https://www.amazon.com/Sharpening-Professional-Whetstone-Oilstone-Sharpener/dp/B09Z1Z2WNL/ref=mp_s_a_1_9?crid=35QUC9RD6QHBQ&keywords=glass+sharpening+stone&qid=1677882178&sprefix=glass+sharpen%2Caps%2C179&sr=8-9
And this seller has some cheaper but not as many grit ratings:
https://www.amazon.com/gp/aw/d/B0BLJXJFPG?ref=ppx_pt2_mob_b_prod_image