I get the "high" price for the fashion item but looking around it seems that a quality bag/belt will cost some serious coin.
There is the classic bag:
https://www.maxpedition.com/products/fatboy-versipack?variant=39445017041 but I'm sure that isn't what you really are looking for.
You may want to look for a "cross-body sling bag" and see what that turns up. The whole fashion thing for a bandolier as a phone pouch is new as the original bandolier was to carry ammo (think of the crossed belts of cartridges on a bandit). I agree that you may do much better by getting some pouches and making your own version. Maybe check some military surplus ideas using molle pouches?