Below $100.00 - Eyepieces in this range tend to be overlooked for their more expensive counterparts. However there are many good eyepieces that fall into this price catagory. Most of the common designs like the Kellner, Orthoscopic, and Plossls occupy this end of the spectrum. These design usually offer up good views at affordable prices.
Above $100.00 - Quality instruments for wide field views or sharp planetary images. Eyepieces in this range usually fall into the common cataegories with a little extra fit and finish. Features generally include better coatings and wider fields of view. Eyepieces in this category offer excellent views on a wide range of targets.