You are plainly contradicting yourself. In your first post, you put no conditions on your support for Costco as along as they offer 'good merchandise at decent prices.' In your subsequent posts, however, you say that you are not going to patronize Walmart because it gets subsidies that cost taxpayers and, following up on that, because it doesn't pay its employees enough so the public has to pickup the healthcare costs these employees incur (which is a dubious position at best).
I don't know how to explain your obviously contradictory positions with regard to Walmart and Costco except to assume that you have an agenda against Walmart that does not apply to Costco. Maybe you can explan what the agenda is and why it applies to Walmart and not to Costco?
As far as I know, Costco isn't costing taxpayers money in order to offer their low prices. Therefore, what you pay is really what you pay. What you pay at Wal-mart isn't really what you pay after you figure in subsidies. I believe in a capitalist system, not a halfway system where they pay their employees barely enough, then the govt picks up the rest.
And as I stated above, my prefered shopping choice is Target. Higher prices, but higher quality merchandise.