Where can I find a discount coupon for Xarelto?

The pharmacist told me I can go online and find a coupon for Xarelto that will significantly reduce the cost of it, but I can't find anything. I find coupons that claim to reduce the cost by 70-80%, but I have doubts about them. Even the one from GoodRX suggests that it will still cost more than what it costs with Medicare.

I asked the pharmacist what the name of the coupon or website is, but he wouldn't tell me. At another pharmacy I overheard that someone used a coupon and paid less than $100 for Xarelto. I would've asked where they got it but I was in a hurry.