Every live buy-miles and buy-points promotion, with the effective cost per mile during the deal — so you know if it beats retail.
Enter what you'd value the points at (in cents per point) — the rule of thumb is never buy points speculatively, only when you have a specific redemption in mind.
Deals refreshed automatically via Award Travel Finder. Effective cost-per-mile is cross-referenced from each program's live purchase-rate tiers where available.