Any shopper addicted to the mass warehouse that is the Costco superstore knows it’s a place to stock up on bulk-quantities of household items, cleaning supplies, and grocery staples. Not everyone, however, knows about some of Costco’s more high-end offerings like its $400,000 diamond engagement ring which recently made headlines. Members of the wholesale retailer looking to spend some serious cash can also buy an emergency canned-food stash and a Bluetooth-equipped massage chair, among others. Here are 15 surprisingly expensive items to be found at Costco. The product description for Costco’s 93-inch-tall plush bear says it all: “Need a Hug? Just go for it with this lovable oversized jumbo bear! A lifetime of love and companionship awaits you with this soft, cuddly friend … Squeeze Away!!!” The Sublue Whiteshark Mix Underwater Scooter (not pictured) has an interesting, if oddly specific, use: it claims to allow people to glide under the surface of just about any body of water. It weighs 7.7 lbs. and runs on an FAA-compliant battery, so travelers can bring the scooter with them on vacation. Shoppers in the market for a luxury home bathroom expe...