My Roomba 770 has finally started die after 5 years of hard work (5 days scheduled vacuum per week), Myer has the best price by far on the 880 right now. iRobot sells this for $699 USD direct.
Is also available on their eBay page: http://www.ebay.com.au/itm//231843297236
Wasn't available for me in store but their eBay does free delivery.
When you mean die, do you mean the battery has given out? How well does it clean I've never really heard anything from someone that used one so regularly.