REPEAT: These are not insurance. You do not cancel any existing insurance to use these. If you are uninsured, you can use these without conflict. If you have Medicaid or VA benefits, then always use Medicaid or VA.
These are discount cards, and again, the takeaway here is that if you are only taking generics or have expensive medications but that you know that will not hit the deductibles, then the cards are ok. Every location will have a different discount, on every medication. I have said in every forum that prescription distribution is among the most complex commercial activities I could possibly name. The number and complexity of inputs is difficult.
You can simply show this email to the pharmacy to see if you can save.
Still still still not financial advice. If you have a lot of medications, or have further questions, send an email to firstname.lastname@example.org.