Noticed this in the Kirrawee NSW store as I was buying grinder wheels and thought it was a good price for 2 of the larger batteries.
Price on their website shows $249 still so not sure whether it's store specific.
http://www.bunnings.com.au/ryobi-one-18v-5-0ah-li-ion-high-c...
Still had about 20 packs left and also a few more packs on the normal shelf.