I bought ours at home depot, the $20 generic one they sell over the holidays and it has hold well. Important to really tight the trunk of the tree well with the screws and keep it filled with water. Good luck!
I bought the Krinner Tree Genie in 2011 even though it seemed absurdly expensive. Now every year I thank my past self, as it is one million percent better than the awful generic ones with the screws.