unfortunately, I've called 6 different places and the cheapest lamotrigine...besides costco...is $55. Cheapest Luvox is $90!!! So Costco it is!

It looks like BJ's and Costco will generally fill Rx's for non-members but you can't pay by check. You might also be able to get mail-ordered refills cheaper (Medco and the like) but you have to plan ahead for that.

I don't see any mention of AZ on those lists, so I have to assume that you'll end up paying whatever the seller wants to demand. If you phone the pharmacies in your area and ask for a price, you should be able to find the lowest cost. My 150mg 30-day fill of lamotrigine costs under $2 with insurance, and Pomco (my Rx insurer) says the retail cost is under $20.