I think a dedicated store for online orders is a great idea. I don't currently use online shopping but am not prepared to say I never will as I don't, of course, know how my circumstances may change in the future.
I haven't checked at Woolies and Coles as I usually buy my Ryvita at Drakes Supermarkets (South Australian independent). I hope Drakes don't stop selling it! Hopefully Foodland in SA will also keep selling Ryvita.