Online the cheapest i could find was the $22 at Walmart anyways for the OEM one. eBay has some, but they are mostly all knockoffs from China.
Here's the link: walmart.com/ip/Acer-A500P01/16560714
The cord is pretty short, which I think is the norm for these. Comes with the US, EU and UK adapter plates.
If you go into the store and give the clerk the number below, they should be able to find it for you. In my store it was near the other tablet accessories, small section.
Hope this helps someone.