I went to Standard Process web site and requested a list of referrals in my area. All of them are chiropractors. My guess is you can buy these products from a chiropractor's office as you would any supplement that they carry. It may be worth finding a chiropractor in your area that carries this product and giving them a call to find out if you can purchase without being a patient or having an exam or treatment.
This is what the email response from Standard Process said. It contained 5 referrals (all chiropractors) and was instantly sent to my email:
Thank you for requesting a referral to a health care professional who recommends Standard Process products. Here are several health care professionals that recommend Standard Process products and health regimens.