For the masonry of the foundation we went out and bought 15 cinderblocks, and suplemented these with clay bricks that we got for free off of kijiji and some concrete pavestones from a neighbor's old patio. Clay bricks can only be used above ground, other wise they will erode. Looking back, it would have been easier to simply use cinderblocks and we strongly recommend it if you don't have other materials to get rid of. Also, buy more mortar than you think you will need. We ended up using a lot of mortar and if you have any extra you can always return it or pour it in the cinderblocks like we did to make the foundation even stronger.