It somewhat depends on the size you want (Generally 0.96″, 1.3″ and 1.5″), whether you want monochrome or color, how you want to connect (Generally I2C or SPI) and what interface chip you want to use (Although some libraries don’t care whilst others do).
 
I prefer the HiLetgo brand myself. You can get a 1.3″ SPI 128×64 SSH1106 OLED LCD Display for US$9 on Amazon. I am currently looking at a 1.5″ RGB OLED from Waveshare for US$19.
 
You can get an ESP32 board complete with a 0.96″ display attached for about the same price as separately. I have one.

Steve, I want 0.96, monochrome, I2C. Trying to stay away from the SPI. Is SPI more reliable? Will look at the HiLetgo offerings. They have not come up in my internet searches. Thanks much.

Hi Robert.
In our projects, we usually use the SSD1306 0.96 monochrome OLED display with I2C.
In most of our projects we use I2C communication protocol. So, if you want to follow our tutorials more easily, I advise to get one that supports I2C.
In this page, we’ve put together some of the places where you can get the OLED: https://makeradvisor.com/tools/oled-display-128×64-0-96-inch/
I hope this helps.
Regards,
Sara

I wouldn’t say SPI is more reliable than I2C. I2C can get a bit hairy when you have multiple modules and you can’t easily change the addresses. Seeing as you only have the one module you probably don’t care. Just make sure that any module that you wish to add later has a changeable address (Or you can use an I2C Multiplexer).

Thanks Sara and Steve. I might try the SPI as well. Just trying to learn while cooped up because of the pandemic. FYI, also learning guitar and Spanish or at least trying to.

Yeah. Spanish guitar is hard (Almost as hard as getting fudge brownies inside an M&M).

Learning something new is great!
I’m also trying to learn a bit of Spanish. It is similar to portuguese, so it’s not that hard for me.
I’ll mark this issue as resolved.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara 

I was in the US Air Force as a younger man. I spent 15 months at Basea Area 4 Lajes Field, Terceira Island. Portugese, to me, did not sound anything like Spanish! It sounded more like Italian + Greek! 

Hi Donald.
Portuguese accent in the Terceira Island sounds very different than mainland Portuguese. I would say that it sounds like French. :’D
The Portuguese accent may seem very different than Spanish, but the words and sentences are very similar.
All languages sound different depending on our mother tongue. That’s something that I find very interesting.
Have a good weekend.
Regards,
Sara