What parts and services do you need in particular??
Don't forget some parts like normal consumables dont need zongshen suppliers. Oil, oil filters, tyres, bearings, chains, globes, spark plugs etc are available at any auto supplier. Go check out the library or internet for how to adjust chains or do an oil change if the info isnt already in this forum. Most bikes use standard adjustment methods anyway and this bike is user friendly for people who want to do their own mechanicals.
Get a manual of Zongshen USA for adjustment specs that apply to this bike such as valve clearances.