The promise: Finds discounts to apply to your online-shopping order.
Available on: Browser add-on
This Chrome-only browser extension (get it at JoinHoney.com) adds a "Find Savings" button to the checkout page of 100-plus shopping sites, including Amazon.com.
Hit the button, and Honey will find and apply any available discounts to your order.
The service saves time and money, says Lifehacker editor Adam Dachis: "It spares you the extra step of testing the coupon codes."
If there's an extra $10,000 in your budget, consider investing in low-cost index funds, buying a reliable used car or taking a European river cruise.