Achilles, E-Pharm Joint Force (Topical), SNS Cissus XT, and Animal Flex are the best I have used. Achilles would probably be best if you are just looking to buy one
Any with Condroitin, Glucosamine and Cissus.
I absolutely SWEAR by Formutech Flexible. 2 caps in the AM and 2 in the PM and my knees and knuckles have seen really significant improvement. With the price Nutra is selling it at you get a 2 month supply for $27, it's a great deal. Check it out!
Formutech Nutrition Rep----------------
We will have our Joint armor out soon
iForce Joint Help is the king of joint formulas in my opinion - immediately relieves pain at the source and works long-term to help keep your joints in great working order. The combination of ParActin and cissus is absolutely fantastic. Combine it with the joint support in Orange Triad and the fish oil by Controlled Labs and you've got a comprehensive general health and joint stack for a very cost effective price.
iFORCE NUTRITION REPRESENTATIVE
iTRAIN. iCOMPETE. iDOMINATE.