Another Poalster recently turned me on to lazarusnaturals.com when looking into it for my dog. Their prices are great and they give hefty discounts to vets, disabled and low income folks. So the cost would depend on whether you get the discount, check out the prices on their website. They are very reasonable compared to other prices I looked at. So far I've found it surprisingly effective. I was very dubious since I've dealt with this pain for a long time and nothing else has helped much. I made my own topical oil which does help some but after taking the RSO CBD I had an entire day without spasms and that hasn't happened for a long time. The amount of THC that is in full-on RSO oil is insane. I suppose you would build up some tolerance but often people who are using it have cancer and possibly on chemo so they probably aren't currently having a very active life. No way could I do that if I had to go to work and function normally. That is the nice thing about the RSO CBD, high potency dosage with no mental high to worry about.