Before black Friday go to a store and touch the keyboards. If you can write something that looks like real work(TM), do it.

You spend a lot of time using the keyboard and build some muscle memory about how far apart the keys are and how much force you have to apply.

also check out refurbished devices. You can get older models a lot cheaper if they are good enough for your needs. 8 GB RAM has been possible for a while now, and at least a SATA or mSATA SSD can be added nearly everywhere.