The Argos Outlet eBay store is currently offering refurbished Nexus 7 16GB devices for only £119.99. 32GB models are £144.99 and if you buy 2 devices you get a 10% discount! Delivery will cost you £3.95.
The units are refurbished to 'like new' standard and include a full 12 month warranty. BARGAIN! :)
No discounts on the 3G model sadly...
Update: The 16GB is out of stock with stock of the 32GB running low. If you are thinking of getting one then hurry!