So, in Arnika, there is Anna. She sells spell books, which is great, but, if you spend too long camping her, to increase your spell levels for instance, her inventory fills up with ammunition, causing the spell books to fall off the end of the list. Is there a way to avoid this? As of right now, I'm buying huge amounts of ammunition with the intention of leaving it somewhere, but I'm concerned that that might affect the game (having a thousand stacks of ammo sitting someplace forever). Anyone have any clues?

Having a thousand stacks of ammo would indeed slow down the game because it would try to render them… there is a chest in that area and you can put things in that.

Note, that the game doesn’t collate stuff in a chest beyond marking that it is there so if you put plot items like a certain marble into a chest then the game will not allow you to enter some plot driven areas… the Rapax camp is the best example of this but there are others.

In addition to jamming everything into a chest somewhere, you can also pick one merchant whose stock you otherwise don't care about and simply sell everything to them. The trynnie at the monastery is probably the best candidate for having an irrelevant inventory (once you're past that area, anyway), but he's also a bit out of the way unless you have someone with a spare portal location. He'li is also a reasonable choice since she's in a central location and doesn't normally stock anything particularly crucial.

So, it seems like there's no way to 'reset' Anna's inventory. I reloaded and made sure to save up and buy all the books I wanted from her first, so now I could care less what happens to her inventory. It would be lovely if a bugfix was ever implemented to keep Anna's inventory from balooning like that.

It is possible to use *Cosmic Forge* editor's capability to have a scripted behavior and remove unwanted items from the NPCs' inventories every time you talk to them.
The algorithm would be something like that:
- remove all instances of arrows (item id x)
- add 2 instances of arrows (item id x) (this is just if you actually wanted to buy some.
- remove all instances of bullet stones (item id y)
- add 2 instances of bullet stones (item id y) (this is just if you actually wanted to buy some.
- repeat for any other missile type item that floods the inventory.

It may sound complex, but actually very simple.
If you want to learn more, inquire here: http://www.postcount.net/forum/forumdisplay.php?47-Wizardry-Series