Clip of Many Bolts (3.5e Equipment)
From D&D Wiki
Clip of Many Bolts: This item appears to be a 5-bolt clip for a repeating crossbow. However, it holds up to 50, 100, 500, or 5000 bolts. Also, the reloading handle turns itself on telepathic command.
Market: 2,500 per 50 gp (50 bolts), 5,000 gp (100 bolts), 15,000 gp (500 bolts), 50,000 gp (5000 bolts).
Moderate conjuration;CL 9th; Craft Wondrous Item, Secret Chest, Mage Hand; Market Price: Varies