There is usually a supplier locally,or not far away,who can supply most common items required,such as belts, pulleys,
oil,grease,and many other bits and pieces Although I,m out in the sticks,there is a place about 5/6 miles away who appears to have EVERYTHING and if he does not have it,he knows who has,next best thing.
So,my advice is to get to know your supplier,call in now and then,just to buy small stuff,and show your face. You never know when you might need him,in a hurry. Most of them are OK and will do their best to help,although you will come across the odd one who does not want to be bothered with small operators,. Just give them a miss and look around elsewhere. All these guys have contacts in related lines,so they can be a great source of information in tracking something down.
Hope you get up and running soon and have fun !