On Vango we use calculated shipping to determine shipping costs before displaying the sales price. We want to make sure the prices collectors pay are consistent. In order to do that on Etsy, artists must have a fixed shipping profile rather than calculated. The Etsy API does not support calculated shipping. Usually artists price the shipping of small works between $15-25; Medium between $25-50; large between $50-75 and XL up to $250 (depending on whether or not there it is on freight).