Based off tekkub's Gnomish Vendor Shrinker, dusted off and brought into the Classic flavors

 

Features

• Simple one-line-per-item interface
• Scrolling list, none of that "paging" crap that makes navigation slow
• Clicking an item simply buys it, instead of picking up the item
• Alt-click buys a full stack (or as close to a full stack as is possible for limited-stock items)
• Recipes you do not yet know are highlighted in blue
• Items you cannot use are highlighted in red
• Search box to help you find that item you're after on a vendor with hundreds of items