This may not be a deal for all, but I needed some good quality paper and found this deal. This is for 100gsm paper. (Most common printer paper is 80gsm)
WH Smith have a deal for buy 1 get one half price, but if you buy two and use the £5 off voucher it makes it buy one get one free :-)
You will need to purchase something for 2p or more (I got some erasers).
I have used other 100gsm paper but personally I prefer this brand so maybe someone else will benefit from this too.