Mucinex DL 600 mg to thin mucus

I n a previous post, Sue mentioned that she uses with great success Mucinex DL 600 mg extended release to help thin mucus for expulsion. However, I have searched Amazon, Google, EBay, and even the Mucinex manufacturer site and no where can I find the DL formulation you referenced Sue. Could I politely ask for a picture of the box showing exactly what you are purchasing in order to help me find the right formulation. Also, where specifically do you buy it from? Because I am having no luck, not even with the manufacturer. I may have gotten your post incorrect and have been searching for the wrong thing. I may have been spinning my wheels because I didn’t write it down correctly and can’t find the post. I will try anything desperately to help expel the constant 24/7 mucus I have difficulty bringing up. So Sue, can you please put me in the right direction. Thank you in advance for any help you can provide.