Anybody have any suggestions on shopping sites for food, supplements, natural products, etc.? I recently decided to buy some kelp powder since I don't have a good iodine source in my diet, and ended up using vitacost.com They charge a flat shipping rate, so I shopped around for a few other bits to make the order 'worth it'. Perhaps using Amazon has spoiled me, but anybody know any sites with a good selection that offer free shipping? A minimum order of $25 or so is fine, I've seen some with $99 but that's too much just to get free shipping.

Thanks.