I have a similar situation with a generic, Levothyroxin.
When purchasing a 90-day supply with my Part D plan at the preferred pharmacy (and mail order, for that matter), my co-pay is $38.50.
When purchasing a 90-day supply with cash at Walmart, it costs me $10.00.
Technical reason for this: My Part D plan classifies Levothyroxin as a Tier 2 generic. Walmart classifies it as a Tier 1 preferred generic and has it on their $4/month ($10/3 month) list.
So why don't I change Part D plans? Because of the coverage I get for an expensive Tier 3 preferred brand drug.
I have said this many times ... when it comes to healthcare, it's a jungle out there.
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