It is good that you want to go to the healthfood store, but you really don't need to. They mainly sell supplements and for the flush you don't need much.
To do the flush you need extra virgin olive oil, grapefruit (to make juice), epsomsalt.
Read cleanses at the top.
May be Fernando (Fsboeira) will answer he had a lot of stones.
A good educational reading is Julia Chang's website http://www.sensiblehealth.com
Fernando uses her flush but he did add Epsom Salt (=magnesium sulfate, not salt) at night, it relaxes the ducts so it easier for the stones to come out.
Most people start with Dr.Clarks's flush, but often skip the ornithine for sleeping or/and the H (?).