I tried Costco for a year and found them expensive, and having to pay to shop there was another incentive not to. !!
I've got a card for Booker's but there are only a few items I would consider reasonably priced. Surprisingly a lot of shops
will haggle. There is a very expensive gent's outfitters near me that sell some nice gear.They always knock the prices down
for "cash". It works in Turkey too.

Years ago I sometimes shopped at Makro and there prices were good but now I think the nearest to me is about 30 miles away.