If you cannot find Kirks Castile in a nearby store, I located a great website with great prices PLUS low shipping. So many of the ones I found with the soap less than $2 per bar had shipping costs that were $1 per bar. LuckyVitamin.com had the bars for $12.00 for 12 bars with less than $6 shipping.
"I want a world that is sane & just & clean & willing to do my part to make it so"
I got some Fels Naptha and Kirk's at soapsgonebuy.com (recommended by a farmgirl on another thread!) Only .99 a piece right now and shipping is only 4.95 for up to 7 bars!