Minna no Golf 6 has been released as The Best series in Japan which is the budget line of games for PlayStation in Japan… to celebrate they are doing a Promotion on half of the Downloadable Contents.
The promotion starts from 10th of October 2013 and ends on the 23rd of October 2013. The discount is a flat half price on old contents and seems to be all the contents up to Lv.4 Gear sets. Everything else is still the original price it seems. For a visual list of what is on special follow the source link.