Walmart offers two McCafe Premium Roast Coffee K-Cup Pods 54-Count Boxes (108 pods total) in Medium for $28. Choose in-store pickup to avoid the $5.99 shipping fee. That's just $2 more than Walmart's own price for only one 54-count box and the lowest per-pod price we've seen. (For further comparison, we saw 84 pods for $25 in September; it's the best deal for this quantity today by $33.) They're compatible with all Keurig K-Cup brewing systems.
If you have or expect to have a modest retirement income, you may want to avoid spending your golden years here.