Quidsi's founder, Marc Lore, has locked his crosshairs on Amazon with his new online marketplace, Jet. The startup plans to use a membership-based model - similar to an online Costco - passing on bulk-purchasing and shipping savings to customers. The deal is structured as a capped convertible note , with valuation discounts tied to a subsequent financing round at a max pre of $450m. Not too shabby for a pre-product company.