Perpetual Kid offers a Glitter Bomb in Punch Happy Pink, Gregarious Lime Green, or Boisterous Blue for $5.99 with free shipping. That's $2 under our mention from last winter and the lowest total price we've seen. (It's a current low by $4, outside of the mention below.) It allows you to ship your friends (or enemies, or frenemies) an anonymous envelope full of glitter.
A close price: Moygo via eBay offers it for $5 with $2 for shipping.