As of now, most iPads will run around the same price as Apple is offering them. You could always see if anyone is selling them on CL. My friend got a brand new iPad 2 sealed in box for $400 off of Craigslist.
If you do buy off a third party resaler, make sure your buying an iPad and not a liePad. However your best bet would be buying off either a certify retailer of Apple Products.
As for buying refurbed, if you do go this route, I would recommend going through Apple.