amazon, just search for them...plenty of companies sell them. I always buy in bulk, cheapest way for sure.
Absolutely. A couple years ago I made all my prints through a basic print shop who didn't know the depths of what a good print job should be. I began to have erratic results from lack of proper calibration and sometimes my requests or orders would be completely ignored. I then realized it was time to upgrade who I printed with and why. I knew this would increase the cost of my prints, but then I could officially state my work in the realm of Fine Art and elevate my status not only as a shop owner but also taking pride in my work and knowing my value. Its worth the jump and people are willing to pay for the quality. Things have only gotten better since I upgraded. Hope this helps!