For those in Canada, check your local Home Depot. They have a Chemical Guys wash bucket kit on seasonal special for $25. Comes with a gallon bucket, a grit guard and 3 bottles of stuff. Mine came with a Citrus Wash, Rubber Dressing and a Spray Detailer, but some reported getting other bottles. The soap alone is like $10 last time when I bought it on Amazon.
Oh, if you do get the Citrus soap, this stuff is pretty strong so make sure you dilute it well. It will strip wax if you put too much.