Did not know about Costco, but not surprised since it is a Seattle area company and many folks in Seattle area are left-leaning. So I will not be renewing my membership. I live in the same neck of the woods as Mill Creek and have seen signs in same places. So I choose to sit in the dining area where guns are allowed instead of the bar area of some of these establishments.
A comment about Wal-Mart/Sam's Club: at least the ammo that I have bought from them is all American made, Federal Self-protection rounds for home defense (just got lucky they had it on closeout sale so bought it), and lots of Winchester and Remington ammo for practicing. It seems most of the outdoors stuff (my primary reason for shopping there) is US Made. I won't buy Chinese made stuff (just like I won't buy French wine, no matter how cheap). Being in the service, and having spent time in the Middle East, I choose to buy from countries that support our coalition (so can buy S&B ammo too).
We all can and should make businesses aware of the impact of their policies on their bottom line. Somewhere I read that 1 unhappy person tells 10 folks, while 1 happy person only tells one or two.
You live to serve the boat, serve well and live!
Socialism kills freedom...
Your right to swing your fist ends when it connects with someone else's nose.