Where I live there are very few hatcheries that raise WE and more of a demand than a supply so therefore the ones I've seen for sale are pretty pricey. Three dollars a piece seems very reasonable priced for WE I'd pay that for some. Also a leader probably isn't necessary, we just have always used them when we go fishing in Lake of the Woods in Ontario. We mainly did so because we were catching a lot of northerns when we were WE fishing and got tired of getting our line cut or nicked.
Mark at Harbin fish farms 2:40 west of ya handles walleye. Most professional service/sales I know of in that area.
