Letting patients purchase them through your office is a great idea! I don’t think I have ever seen them in a grocery store come to think of it. Your patient could order them online too: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=disclosing+tablets&tbm=shop
Amazon has everything!
http://smile.amazon.com/s/ref=nb_sb_ss_c_0_13?url=search-alias%3Dhpc&field-keywords=disclosing%20tablets&sprefix=disclosing+ta%2Caps%2C261
Do you know about Amazon Smile? If not check it out! Part of eligible items are donated to a charity of your choice! 🙂