Silver Sales via eBay offers these NCAA 3-Dot Sports Wrap Sunglasses in 32 teams (Georgia Bulldogs pictured) for $9.99 with free shipping. (101fans via eBay has them in 28 teams for the same.) Excluding the below mention, that's the lowest total price we could find $3, outside of other eBay vendors. They feature 100% UVA/UVB protection.

Of note, Boca Fan Gear via eBay has them in Michigan State Spartans for $8.40 with free shipping.