I just updated my midibox seq4 with a couple 40x2 character displays from EastRising. The company offers over a dozen different color combinations and the prices are cheap ~ $10 USD. I can confirm these work perfectly with the midibox platform.
And they have some nice oleds too. I’m expecting, that they are working with midibox? http://www.buy-display.com/default/oled-display-module.html There is no breakout board. So a bit of soldering is necessary, but they are nice and cheap… Are there any problems with that?
I found the quality of these to be mediocre at best, not even close to a newhaven or Kyocera. I tossed mine, not worth the $8 I saved and the 4 week delivery. Backlite was crazy inconsistent over the length of the part (you can kind of see the same thing in duggles pic)