I have two stacks of concrete block, most is flat on both sides, some have a texture like chiseled stone, on one side.
Text me and I will tell you the address (cloes to Penn Ave, Swissvale, Ardmore) so you can go get them at your convenience.
Blocks came from a Garage, the garage roof rotted over 10 years ago, garage wall fell down 3 years ago, and we just replaced the back wall with retaining blocks.