I got the Avery Return Address lables and used my printer to turn those into price tags. I had a full sheet of .25, .50, 1.00, 2.00, 3.00, 5.00, 10.00, 15.00, 25.00 price tags in a matter of minutes.
Put up signs that say all prices negotiable,
Display items neatly, make sure all toys have batteries in them, make sure all electrical items are plugged in and can be demonstrated.