Here in Florida, many of the advantage plans include otc freebees. Some $45 a quarter, some as high as $160/quarter. There is a catalog, and CVS seems to be contracted to fulfill these for many outfits.
WellCare and Aetna for two contract with CVS. This has nothing to do with the Rx benefits you cite.
Yep, I see now you stated OTC products which I missed the first time. Where I live (this particular county in eastern WA State) there is only one Medicare Advantage plan even offered, administered by a minor player with very few enrollees. The rest of us are in supplements usually with Part D added.