- Buying them from a non shop interface where we can sell arbitrary groups for arbitrary prices,
- Selling "Bundle of Arrows" that can be 'used' to create a bunch of actual arrows, which allows us to use keep using normal shops to sell them (I think these could randomly give you slightly more or less arrows)
- Altering shop mechanics to allow selling groups of items instead of individual items (IE make arrows only available in multiples of 5 and charge less than 5GP for each group).
- Give monsters hit by arrows a chance to add the arrow to their drop list (so you'll be able to recover a portion of your arrows)
Thoughts? Other suggestions?