he will also sell Bucket and Silence Orbs. Silence Orbs i haven't seen anywhere else yet (digging around, shops). Bucket i think might be a common rune for sale in one town but can't recall, i know it's a Bargain Item in Pirate's Nest.
comparing Hunter to Silence, at least there is 1 Hunter Rune in Graska Palace.. also, what good is Hunter Rune in this game? not many drops are impressive (not even dragons; you can get everything you need from dragons fairly easily) and steal items aren't that great either (again, the only unique item seems to be the elemental mirrors; might be able to dig up or open a chest with 1 for a few elements in the elemental chambers)
the only thing i would want to use Hunter for is in new game when i fight those Frogs that have a small chance of dropping Bersek Belts (i never got none!!!!)
btw you do not have to complete ALL of either side's quests to 'max out' Chiepoo or make him completely bankrupt. i maxed him out pretty early and continued to do the Chiepoo quests because i hadn't fought/recruited the mercs yet. i took on almost all the X & Co missions in one shot and since the dispatch missions have different expiration dates, i kept checking his progress. i KNOW he became bankrupt right after completing all but 1 X & Co mission (and 1 Chiepoo mission became available after doing a X & Co quest 'Savage Sprout Seeds Wanted')