Amazon.com offers the Set of 4 Zak Designs Triangle 15-oz. Goblets in Green for $8.67. Shipping starts at $7.35, but is free on orders of $25 or more. Even with shipping, it's the lowest total price we could find for this goblet set.

Better yet, buy three sets and get a fourth for free. That's $26.01 with free shipping, or $1.63 per glass.