Costco has been going up forever and it is almost at an attractive buying point. It broke my trend change line so I would epect it to go sideways for a few days before continuing the upwar trend. It will probably bounce arond 116-120 so try to get in as close to 116 as possible. Long-term upside potential is undetermined but it should go past its most recent highs of 126 no problem.
I would use 113 as my stop loss if you are looking for the quick dollar.
I would use the weekly support for the long-termers.