I just got an ad from Seeed Studio. It offers an 8G Raspberry Pi 4 for pre-order. I didn't know of this new RAM size before seeing the ad. Estimated availability date is June 5. <https://www.seeedstudio.com/Raspberry-Pi-4-Computer-Model-B-8GB-p-4595.html> US$75 for a computer with 8G seems quite reasonable. Being greedy, the only Pi 4's I've purchased have been 4G units. I will probably only buy 8G units in the future. I admit that 2G is enough for many purposes. 8G certainly makes a 64-bit OS more desireable. I think that Raspbian is still only 32 bits (so that all Pi's are still supported by one image, I think). Seeed is an interesting "maker" sort of vendor. I have ordered a couple of Pi 4's from them in the past. I consider them reputable. Slowish delivery (from China). They do have a warehouse in the US too. See also <https://techcrunch.com/2020/05/28/raspberry-pi-foundation-announces-raspberry-pi-4-with-8gb-of-ram/> This says that the Foundation has started working on 64-bit Raspbian. 64-bit Ubuntu and other distros are already available now.