There's no such thing as "decently cheap RAM drives" anymore. Even mine, in used condition, are worth $500 with no RAM per ebay.

They do have a battery and backup to a CF flash card on a loss of power of >60 seconds or so.

If someone is serious about buying one, I do have 3 or 4. PM me for more. They will include RAM (one is maxed out at 32GB too).