Until December 31, 2015, you can up to 20,000 Starpoints with up to a 25% discount on the normal purchase price.

Starpoints are normally sold in increments of 500 points for 3.5 cents per point.

Last week I posted that LifeMiles were being sold with a 125% bonus, bringing the price down to 1.47 cents per mile. In the past I have purchased LifeMiles when the price dipped to 1.5 cents or less because that allows for a one way ticket in Business Class to Europe for about $1,000.

If you are an InsideFlyer member (free sign up), you can get an extra 10% bonus on your purchase, bringing the price of purchasing 92,250+ miles down to 1.47 cents per mile and purchasing 237,750+ miles down to 1.40 cents each.

Avianca LifeMiles is offering a bonus of up to 125% on purchased miles through December 18, 2015. You can buy up to 150,000 LifeMiles during the sale and get up to 187,500 bonus miles.

LifeMiles cost 3.3 cents each, so with a 125% bonus, you get the miles for 1.47 cents each.

Alaska Airlines' newest miles sale offers miles as cheap as 1.97 cents each, which means Emirates First Class from the United States to Dubai for around $1,800 (or anywhere else in the world for around $2,000) or Cathay Pacific First and Business Class from the United States to Hong Kong and Johannesburg for around $1,400.

Until December 23, 2015, Alaska is offering an instant mystery bonus on miles purchases of 35% to 50% more miles.

Through December 14, 2015, United is offering up to an 85% bonus on purchased miles. The maximum bonus is targeted with some people being offered 60% and 70% bonuses. Also the size of the bonus depends on the number of miles you buy, with the largest 60%, 70%, or 85% bonus kicking in at 40,000 miles purchased.

Log into your account here to see the bonus you are offered. I was offered the 85% bonus.

United miles normally cost 3.5 cents per mile plus a 7.5% tax, bringing the full price to 3.76 cents each.

American Airlines is running a sale on the purchase of their miles through November 13, 2015. You can buy up to 125,000 American Airlines miles during the sale and get up to 35,000 bonus miles plus 10% off the normal price.

The discount is fixed, but the bonus miles are tiered, based on how many miles you purchase.

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

Through October 23, 2015, United is offering up to a 80% bonus on purchased miles. The size of the bonus depends on the number of miles you buy, with the largest 80% bonus kicking in at 30,000 miles purchased (54,000 total miles after the bonus.)

United miles normally cost 3.5 cents per mile plus a 7.5% tax, bringing the full price to 3.76 cents each.

Avianca LifeMiles and InsideFlyer are offering a 150% bonus on purchased miles through October 12, 2015. You must buy 100,000 to 150,000 LifeMiles (pre-bonus) during the sale at a minimum cost of $3,300.

LifeMiles cost 3.3 cents each, so with a 150% bonus, you get the miles for 1.32 cents each. For instance, if you purchase 100,000 LifeMiles with a 150,000 mile bonus for 250,000 total miles, it would cost $3,300 or 1.32 cents each. That’s the cheapest I’ve seen LifeMiles sold.

Through September 30, 2015, United is offering up to a 75% bonus on purchased miles. The size of the bonus depends on the number of miles you buy, with the largest 75% bonus kicking in at 40,000 miles purchased (70,000 total miles after the bonus.)

United miles normally cost 3.5 cents per mile plus a 7.5% tax, bringing the full price to 3.76 cents each.

Through September 30, 2015, United is offering up to a 75% bonus on purchased miles. The size of the bonus depends on the number of miles you buy, with the largest 75% bonus kicking in at 40,000 miles purchased (70,000 total miles after the bonus.)

United miles normally cost 3.5 cents per mile plus a 7.5% tax, bringing the full price to 3.76 cents each.