yup...KIS organics is a great reputable company and they have a lot of amendments available in bulk, etc. Shipping is a pain if you're not in WA, but still a great resource. They carry everything you need to build a soil from scratch/reamend an old soil - compost tea equipment, etc. all at reasonable prices.
KIS Organics
another great place in the PNW is
Concentrates, Inc. in portland. bulk amendments/soil/garden supply. supplies thousands of large scale operations in the northwest - really good pricing.
not that we are supposed to advertise here....but these are truly good sources that organic heads should know about