http://slo-pitch.com/content/northern-shootout
Worth Sports
http://slo-pitch.com/content/northern-shootout
National Championships
Make the Call - Umpire Recruitment
https://www.instagram.com/slopitchnational
 
Why do membership fees vary between regions?

There are a variety of services and benefits offered to teams/leagues/umpires within each region.  Fees are established based on the costs to provide such services and benefits. Also, all taxes are included in the fees and tax structures vary between regions.