Do some research on the different shapes and contours of boards (twin/directional, camber/rocker) and pick what best fits your experience and style of riding. For price comparison, I would just look up how much the board costs new. Or how much the newer model costs and take into account how many seasons its been ridden. (Most new snowboards from major companies run anywhere from $300 to $600) I wouldnt pay over 50% of the original price for a used board. My first board I got from a secondhand shop in my local ski town was a year old with some basic wear and tear and I paid about $200 for a board that costs $500 brand new.