40% bulk discount will apply automatically at checkout when you order 50 pairs or more. We ship these wedding favors for guests in bulk super fast (usually delivered in 5-7 days or sooner) but let us know if you need faster  We typically recommend a sizing breakout of 10% small, 40% medium, 40% large and 10% extra large but you are free to mix/match any combination of sizes/colors you like.