Me too! I have two of them but will need a slightly bigger one when we have a second baby. They often have bags on sale on their Australian website - I bought both mine for half price
I have two as well, both brough online during their sales Trying to convince DF I need another one.. I dont think I will have much luck

Storksak also have a facebook page and they often annouce sales through their page ahead of the sales and should add they have free postage as well.