I guess it depends on how many you go through. psprint.com does 4x6 full color one side, blank back postcards, 500 for $58 plus shipping. There are piles of other printers online that are comparable. In a pinch, upload your front image to Walmart's photo center and order a handful at a time. Sometimes, the photo paper brand is lightly printed on the back, but not always. I used to do that for concert handbills...... Source: almost 2 years ago

You might try psprint.com they do great work. Source: almost 2 years ago

When I worked as a Graphic Designer at an online print-shop similar to moo or psprint.com etc, I was being paid $21/hr (plus benefits, and so on), obviously not using my own hardware. This was back in 2006. I was mostly doing correction work for customer submitted files, and then I would send these to pre-press or reject the file, with a small smattering of walk-in and appointment based design. A little different... Source: about 2 years ago

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