JP Aerospace for many years has for free taken student PongSats to NearSpace on their high altitude airship flights. Now they are expanding on this with their PongSat Launch (PSL) System, which “consists of a small reusable sounding rocket launched from an airship”. The rockets will reach 100 km. A writeup on the system is provide here: PongSat Launch System – Small experiments flown to space at no cost to students – JP Aerospace (pdf).
Check out the latest developments at JPA on their blog.