Ability to purchase large quantities of items at once, but receive them in smaller quantities throughout a timeframe. ie, purchase 50,000 stickers up front, and request shipment of 10,000 at a time whenever on-hand inventory reaches a low level.
A great add-on for online retailers is to drop ship via USPS a single of my favorite StickerMule product as a thank you to my buyer. I've pre-purchased them and they're in stock at your warehouse, and I've preloaded a thank you note you'll print and stuff. Phase one is I manually drop them logged into your site, and pay you a fixed fee for mailing and handling . Phase 2 WooCommerce (or other) sends you my buyer's name and address through an API and it's fully automatic. I'd be willing to run a pre-paid balance with you for S&H. This is by far, the best idea, ever.