Harbin's Offers:
Buy:
GOLD RING: 10gp
JADE FROG: 40gp

TREASURE CHEST WITH KEY 2gp
MESS KIT 8cp
-Note: without a mess kit, eating will be ironically more messy and may affect your mood in certain instances.

HOODED LANTERN 2gp
DARTS (10X) 3sp
BELT POUCH (2X) 4sp

I'd store:
MYSTERY MEAT (TOTALLY NOT HUMAN)
ROUGH AMETHYST
RINGS OF SHARED SUFFERING
SHORT SWORD OF SHARP TONGUE
MY EAR COLLECTION

Harbin's Supplies:
Sell:
SOAP 2cp per bar (5 uses)
CHALK 1cp each
OIL FLASKS 1sp 1lb (he has 5) 

He also has things like: 
Sealing wax 5sp 1lb (can be used to seal bottles for potion crafting, and to reseal other containers including clar jars. 10 uses per lb)
Cleaning grade Alcohol (70%) 2sp per lb
Agar (may be used as an emulsifier) 1gp per lb (10 uses)
Lantern wicks 2cp each
Light Glass vial 5cp .25 lbs.
Glass bottles 2gp each .25 lbs
Reinforced Glass bottles used for containing volitol liquids, 50gp each .25lbs
He has many other chemicals, like amonium nitrate and other alchemist supplies.