Digital booster packs allow users to extend their Digital Lite subscription plans. These are available in packs of 80 and 40 stories. The 80-story pack costs 900 yen ($9) and the 40-story pack costs 500 yen ($5).
Note that Digital Lite subscribers can only read a limited number of Kyodo archive stories (Kyodo News stories older than one month). You also have the option of switching to the full Digital plan, which offers unlimited access to all articles including Kyodo archive stories.