Where can I find a LIFESIZE Maxine Doll (from Hallmark) to purchase?

Apparently the $785 lifesized Maxine doll was a limited edition which
is no longer in production:

http://www.permutator.com/hallmark/hobbies-and-interest/products-physical-products-maxine/Lifesized-100112.html

I have not been able to locate a used doll. I would expect that the
price, which was rather hefty to begin with, may have gone up
considerably, since there may be quite a demand from collectors.

You might be interested in this Maxine vacuum cleaner cover that is
offered on eBay:

"You are bidding on a Maxine vacuum cleaner cover. She is in great
shape, from a smoke free environment. She stands approximately 55
inches tall. On her pocket it says 'Kickin dust bunny butt!'. A must
have for any Maxine lover."

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3243294079&category=41149

You may have success calling or stopping by Hallmark Gold Crown stores
in your area.  Some stores bought these for display and may be willing
to sell it to you.  If it helps, the sku id for this item is 1MAX2500.
 A store may be able to order one for you but I believe it is even
unavailable through those channels as well.  Good Luck.