Not an issue!  More than happy to help.  The key is to check the ingredients list.  Most of them will have Fexafedimine below the brand name, which makes it easier.  Then just get the cheapest one.

 

Retired medical technologist and engineer
REI member since 1978
Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.