What price and from where first of all, beware of the many scams out there, as these are quite hard to come by often a good price plus in stock is a little bit dodgy. Also have in mind that Dragonmint will release a 16th miner in the next few months which will be more profitable than the s9 currently is. However if bitcoin rallies again to over 20k then i can see the s9 still being profitable for a while but to know fully i would have to know the price your going to pay to know whether it makes sense or not. Also calculate import fees if it is from China.