Compressed organic soil at Walmart,10.98 bucs per 2.25 cubic.
 

[url]http://www.walmart.com/ip/Expert-Gardener-Organics-2-25-Cu-Ft-Expanding-Soil-Concentrated-Potting-Mix/926142788[/url]

They gave me six only per order,on that day,ordered six more the next day,free shipping over 35 bucs.

For coco peat it's quite a good price. New growers in coco should watch out though, it's not the easiest medium to grow in, especially for seedlings.