24-of the curved pieces for $1 each (tan few of them have some darker grey coloring mixed in)

http://www.homedepot.com/p/Unbranded-12-in-x-7-in-Pewter-Concrete-Wall-Block-81100/100333178?N=5yc1vZbx7aZ1z0t5gq

16- of the squared blocks for $1.50 each (most are grey and a few are redish brick)

http://www.homedepot.com/p/Pavestone-7-in-x-7-in-Sierra-Blend-RumbleStone-Medium-Wall-Block-91777/203177274?N=5yc1vZbx7aZ1z0t5gq

Can buy them at individual price or the whole batch for $40 saving $8