By Cam Vigliotta There’s a good chance you already have a grill somewhere in your backyard, but when’s the last time you replaced it with a newer alternative? If it’s rusty, leaking or simply scorching your favorite summer foods, you might consider upgrading your grill even if it has a few years of life left in it. After all, Memorial Day is only weeks away and, as luck would have it, Z Grills is holding a massive sale on our favorite BBQ bundles. Based in Salt Lake City, the label designs award-winning pellet grills that are durable, simple and sophisticated, and each one comes complete with …