You Always Have Three or More Printers Competing With Each Other For Your Work.
You may think this is a good way to do business. And it is to some extent. But here is why it usually isn't a good way to deal with printers.
A good printer has enough loyal customers that they don't have to deal with price shoppers.
Once you find a good printer, you must be loyal to them. If you flip-flop from printer-to-printer, a good shop won't be too motivated to keep YOU as a customer.
Price is important. But price should not be more important than good quality and good service.
This is what purchasing agents typically like to do. They try to get everyone fighting for the same piece of pie. This might be an OK short term strategy because you save a few bucks. But, when you need a favor, or super fast turnaround -- not one of these companies will instantly bend over backwards to help you. (And if you have been a price shopper in the past, they will probably charge you more!)
Every printer expects to bend over backwards for their loyal customers now and again. He or she might have to work all night, print a super rush job, or pull off a miracle. Provided the customer is loyal, the printer will do all he can to help you meet your deadline.
All good printers will be loyal to you if YOU are loyal to them.
Keep loyalty in mind when you pick your printer.