I just checked ... there are also some poisons (many out of the DMG) that are basically just a consumable item. They don't have associated recipes like the alchemy items, but they have a level and price, so they can be purchased. Some give a special condition that limits how the poison can be applied, but otherwise they are either applied to a weapon (if you hit and deal damage with the weapon you can make the poison attack roll to get it's effects), put into food, drink or inhaled. In terms of in combat usage, they only mention that applying it to a weapon is a standard action, and that it goes away after 5 minutes if the weapon hasn't hit and delivered the poison yet. No mention on what sort of action it would be to scatter the powder to be inhaled, so presumably that's not meant to occur in combat (or I guess just make it a standard action, and probably make it close blast 1 (i.e. target 1 adjacent square/enemy). They are priced the same as other leveled consumable goods (like alchemy items, potions, etc).