In December (which is very soon!), per Engadget, you’ll be able to get a touchscreen Chromebook for $299! I’m disappointed that it doesn’t have 4GB of RAM, but that’s a concession, I’m sure, to keep the price under $300. I’ve not seen much definitive telemetry yet on memory upgrades on the C720 series Chromebooks (I added 4GB to my C710-2833 earlier in the fall). Traffic on the Chromebook Central site implies that the memory is not upgradeable on the C720’s but the Acer website for the C720’s says that there are 2GB and 4GB models, and that the 2GB models have a max of 4GB. Check back on Chromebook Central to see what the hive mind says about upgrading memory on the C720’s. I assume if you can upgrade a C720, that a C720P can be, but that may not hold true.
The bottom line though, is that it’s exciting to see touch coming to such an inexpensive laptop!