Good source for 128x64 OLED I2C display?

Last time I bought a couple of these I think I paid $3/each, but it looks like I can't get five of them for less than around $5/each. Anyone know of the best source for them?

Anyone know of the best source for them?

What does "best" mean? Cheapest?

Yeah, cheapest. Not much else to judge them by? I just found a sweet deal on BangGood...5 displays for $13.