My mobile scanner is one of my favorite pieces of equipment.
I have the Epson 580. I bought it refurbished through Epson and paid about half of what it sells for new. It has been great! It scans SO fast! If the job is under 100 pages, I don’t even need to bring my laptop because it goes through the phone. (Over 100 has to go through the laptop).
My suggestion would be to keep an eye out for a good deal and grab it when it comes up.