Lowes [lowes.com] has 11.7" square patio stones for $.88 each in red [lowes.com]
, grey [lowes.com]
or tan [lowes.com]
Also, they have the Holland Red/Charcoal Pavers [lowes.com]
for $.25 each.
AS ALWAYS, LOWES PRICES AND AVAILABILITY VARY BY STORE SO GOOD LUCK WITH GETTING THESE PRICES IN YOUR AREA.
They are good for a simple walkway or small patio area but not for autos.
Prices good through April 4, 2018