Brownells is the worlds largest supplier of firearms accessories and gunsmithing tools. Their headquarters and main facility is still located in Montezuma, Iowa where the business began.
Here's a link to their history:
http://www.brownells.com/aspx/general/About_Brownells.aspx
They have a huge selection of everything you could ever need for firearm repairs, accessories, and reloading equipment.
I stop into their front office regularly just to pick up catalogs for friends. Very friendly Midwestern values people.
I think this may well be more a decision based on at the proximity to their HQ. According to MaqQuest, Grinnell ia only 21 miles from Montezuma and less than a 30 minute drive. If it weren’t for everything running N/S and E/W it would be 15 minutes.