The Joplin Sam’s Club got a pretty big upgrade — a six million dollar one. Employees and the Chamber of Commerce held a grand re-opening of the club this morning. It’s the first major remodel since it opened in 1993. The newly renovated Sam’s club will feature a revamped cafe, walk-in coolers and a health and wellness center. Sam’s Club manager Rob Thomas says, “It’s beautiful. We are just happy that the company invested the money in Joplin Missouri. I’ve never been a part of s…