I am interlocking my patio and I have the following patio stones available (all lifted up and stacked to go - will help load up):

Patio Stones - Grey
24 inch x 30 inch $3.50 obo each (18 available)
12 inch x 30 inch $2.50 obo each (3 available)

Patio Step - Grey
36 inch x 14 inch $7.50 obo (1 available)

I'm located in Ajax