Judyanne:
You might also try Cal-West Tropical Supply...I order pots and supplies from them frequently and am always pleased with their service, supplies and shipping cost. As mentioned though, you will pay more for shipping of potting media
Calwest Orchid Supplies
You might also try looking at a Lowes or Home Depot if you have access to one. I have cound CHC at both in the past, usually in the spring.
Adam