Look for a Native at 'Who's Hiding' locale or at Trading Post. They may drop Jungle Wisteria (C) at any time during the Trading Post shifts or they will let you know by moving a chip at 'Who's Hiding' locale.

Every box they drop contains 10 Jungle Wisteria (C) and inside 3 of those are one bead of 3 credits. Meaning, there are 3 beads for 3 credits each per every 10 boxes.