Mouldings Unlimited are off the beaten path so you will have to drive to get their, but you will be happy with the selection and prices. Mouldings Unlimited produce and warehouse in White.
Since the manufacture the product, they pass the saving up to 50% over the big home stores to the consumer. They also have the largest selection of mouldings around. I was able to get enough crown moulding to do my house for around $400 and that is for real wood, not foam. I would highly recommend them to anyone.