I have been trying one supplement for my kitties, and I purchased it at a great deal atPlease Log In to view this link!. Since I got such a good price on it, if I buy that item again in the future, I will probably purchase it there. I was at a store yesterday and found another supplement I think would be useful with my cats, and was going to purchase it, but it was the last tube, and I noticed it had been opened and possibly used, so I didn't purchase it. When I got home, I looked for the same product online, and saw that the prices varied significantly from site to site. Surprisingly, I found the best deal to be at Walgreens.com, with their price being almost 1/3 of the cost of the same exact item at a few of the other sites. The product isn't sold in their stores, but I was able to purchase it online and either have it delivered to my home at a shipping cost, or have it delivered to the local Walgreens store, where I can pick it up for free. Since Walgreens is right next to my Kroger and I'll be there in a few days, I chose to have it shipped to the store. One of the reasons I chose to have it shipped to the store for free, rather than spend a little money having it delivered to my home is that I live outside of the city limits, and there was an additional delivery charge. I'd never seen that before, even though I shop online frequently, so I opted for the free ship to store instead. I also will be getting some money back on the purchase because I used Ebates. I'm glad I did the internet search for the product, rather than simply going to the well known sites, because I saved quite a bit of money in doing so.