Through July 14, 2017 (tomorrow), you can buy up to 30,000 Starpoints with up to a 35% discount on the normal purchase price.

American Airlines is offering up to 100,000 bonus miles + a 10% discount when you purchase American Airlines miles through July 31, 2017. If you buy the largest amount possible, you can get them for as little as 1.72 cents each. That’s the cheapest I’ve ever seen American Airlines miles for sale (we also saw them on sale for 1.72 cents each this time last year).

Bonus miles are tiered based on how many miles you purchase.

Through tomorrow, June 30 at 23:59 hr BST (British Summer Time) you can buy British Airways Avios with a 50% bonus. I've never seen a onuses greater than 50% on the purchase of Avios before.

The maximum amount of Avios you can buy through this promotion is 100k. With a 50% bonus, that means you can add 150k Avios to your account.

American Airlines is offering up to 100,000 bonus miles + a 10% discount when you purchase American Airlines miles through June 30, 2017. If you buy the largest amount possible, you can get them for as little as 1.72 cents each. That’s the cheapest I’ve ever seen American Airlines miles for sale (we also saw them on sale for 1.72 cents each this time last year).

Bonus miles are tiered based on how many miles you purchase.

Through June 2, 2017 at 11:59 CT (today and tomorrow), United is offering up to a 67% bonus on purchased miles.

Alaska Airlines MileagePlan is running a 40% bonus sale, available to the first 2,500 MileagePlan members who take action. You can buy 10,000 Alaska miles at a time that will come with a 4,000 miles bonus. If 2,500 members don't purchase sale miles by 11:59pm on May 3, the promotion will end then.

Including taxes, you'll pay $295.63 for 14,000 miles, or 2.11 cents per mile. We've seen Alaska miles on sale with as much as a 50% bonus, allowing you to buy them for 1.97 cents each.

American Airlines is offering up to 115,000 bonus miles when you purchase American Airlines miles through April 13, 2017. You can now buy 265,000 American Airlines miles including bonus for $4,786.88 or 1.8 cents each.

Bonus miles are tiered based on how many miles you purchase. The best deal is to buy 150,000.

American Airlines miles cost 2.95 cents each plus a 7.5% excise tax, and every purchase has a $30 processing fee.

Through Friday (February 17, 2017), you can buy 5,000+ IHG Rewards Club points with a 100% bonus.

Until today (December 31, 2016), you can buy up to 30,000 Starpoints with up to a 50% discount on the normal purchase price.

The discounts are targeted. To see your discount, sign into your SPG account at this link. I was offered the maximum, 50%, discount on purchases of 5,000 or more Starpoints, and I bought 20,000.

Starpoints are normally sold in increments of 500 points for 3.5 cents per point. Getting a 50% discount brings the price down to 1.75 cents per Starpoint.

Until today (December 31, 2016), you can buy Alaska Airlines miles with up to a 40% bonus. Log in to your account at this link to see your offer.

The sale is structured as a bonus on the normal number of miles you’d receive.

The bonus is tiered, so the biggest 40% bonus comes from purchasing 40,000 to 60,000 miles at the normal price of about 2.96 cents each after tax.

It costs $1,774 to buy 84,000 miles (60k + 24k bonus) during this sale.