Items

You can sell items for half of their cost (rounded down).  Some items can not be bought, but only found, won, or grown.  The cost to buy them is still listed, it's just twice the price for which you can sell it.

The items are divided in 7 types

Common Items
Ressurrection Items
Seeds
Class Change Items
Throwing Items
Magical Items
Special Items

Common Items: Items sold in item stores in towns (except for the Dreamsee Herb), grown from Item Seeds in Inns, won in chests, and found.

Ressurrection Items Items sold in item stores in towns, grown from Mysterious Seeds in Inns, won in chests, and found.

Seeds: Items won randomly in chests.  If you plant them in Inns they give you an item depending of the type of seed.  They can also be used to restore 50 HP to each party member.

Class Change Items:  These items are grown from ??? Seeds.  These items are needed to do a second class change at level 38 and up.  They can also cast a spell if used as an normal item, but they break after use.

Throwing Items: Items bought in the Black Market in Byzel (except for the Shuriken), grown from Flying Item Seeds in Inns, and won in chests.  The damage is higher if the character who uses it has a high dexterity.

Magical Items: Items bought at Black Market (the items which can be bought there have an * before them), grown from Magic Seeds in inns, and won in chests.

Special Items:  Items which are necessary for the advancement of the plot (not all items are found in each quest).   You'll know where to find them and you can't sell them.  These items can not be bought or sold.