I think it's unlikely you'll find any place locally that would have correct bus tires in stock. You need reinforced sidewall 185R14 tires with at least a 'C' load range for proper handling, safety, and to support the weight of the vehicle. LRD would be even better.
Continental Vanco 8s are a good choice, Continental is a German manufacturer and OEM supplier of tires to VW to this day. Yokohama Y356 also fits, that's what I have on my bus but they are not all season tires. Hankook RA08 is also supposed to be a good bus tire. All of these run about $75 per tire I think.
I would probably order a set of tires online from
Tire Rack or
Bus Depot and have them mounted/balanced locally. Do not let a shop talk you into purchasing passenger tires for your bus. They will not support the weight and it will handle like crap.