Outside home renovations get expensive quickly, with even little fixes racking up a costly bill.  Here are five easy tricks to ramp up curb appeal, all for under $50 each:   Spruce up your mailbox Paint your front door Brighten up your sidewalk with path lighting Give your shutters and trim a fresh coat of paint Spring for new house numbers De-grime your driveway Here’s a closer look at each. #1. Spruce Up Your Mailbox One of the first things a potential buyer sees is your mailbox. Spruce it up with some new decal numbers on the side that are