I think we've decided to have metallic confetti thrown during our exit so I've started to look around online for supplies. I'm seeing that alot of places price and sell their confetti by the pound...how on earth do I figure out how many pounds I need?? Has anyone else purchased confetti this way? We're expecting 150 guests...and I'm sure not all will still be around for the exit, but I'll go ahead and estimate based on that number for now. How much should I get to make sure there's at least enough for a handful for each guest? I intend to pre-package the "handfulls" in little bags.