Jet Privilege has been running Jpmiles sales every even month of this year, each with a Bonus Offer. First was the February offer with a 40% bonus, then the April offer with a 40% bonus (going up to 50% if you were the top buyer of the day), and finally the June offer – again for a 40% bonus.
Here's another such offer for a 40% bonus on the purchase of JP miles. This offer is valid for purchases till 31 August 2016.