United’s newest online shopping partner is drugstore.com, and through December 31, they’re offering 1,000 bonus Mileage Plus miles for your first purchase. There are several items for $1.19, though unfortunately standard shipping is about $6. But still, that’s over 1,000 Mileage Plus miles for under $8. Purchases must be made through this page to qualify.
Travel sized bar of soap, here I come!
Their prices actually seem reasonable, though, so if there’s something you actually need, there is free shipping on orders over $25.
(Tip of the hat to Alex)