It depends, but I think for a "good" 4-blade even in 24x30cm 55-75 USD is not a good but a "very good" price. Most 4-blade easels, however, are hardly good. Among those that are acceptable new, many don't age well and tend to be in poor shape. The question then is not what is a good price for anything but for something specific. The first part of the question then is "which easel is good".
Originally Posted by panchromatic
Some like the Salthill is better than good---- if you have one for 55-75 USD in good condition I'll pay you a premium. Other than the Salthill, my favorite 4-blade is the old Leitz/Leica. The Sauder's V-Track is pretty good and the Proton/Beard is also nice. Some like the Dunco models are OK when brandnew but they don't hold-up very well. The Kaiser Promask is excellent--- its the evolution of the Leitz/Leica, although not quite up to its quality it has a few nice features.