I have no idea what eparcel rates are nor do I know what courier rates some sellers will get if they use a contractor but although I know it costs me $9.35 to send a 3kg satchel with tracking I do sometimes absorb some of that costr into the item price and quote less than that for postage, I also offer free post on some books.

However I couch the charge I am asking the same cost in total and if buyers are blinded by that ihnto buying from me because my postage appears cheaper then good for me, there is nothing to stop you or anyone else doing the same.