This is an awesome deal from Primary Arms. Shipping is under $4 for USPS delivery.
Troy Rear folding sights are top quality. They usually go for $92 and up for street prices.
BLACK FOLDING SIGHT
https://www.primaryarms.com/Troy_Rear_Folding_BattleSight_Black_p/ssig-fbs-r0bt-00.htm
FLAT DARK EARTH
https://www.primaryarms.com/Troy_Rear_Folding_Battlesight_Flat_Dark_Eart_p/ssig-fbs-r0ft-00.htm