It looks like the Nook Simple Touch is being discontinued in Sainsbury's stores, currently £29.99 in the Staffordshire area.
I'm not sure if this will be national but it's certainly a steal at this price.
A couple of links to extend the abilities of the Nook:
Multitouch hack: http://www.theverge.com/2012/4/8/2934528/nook-simple-touch-multitouch-hack
Kindle app: http://youtu.be/7lH4K7-4-1w
*EDIT* I didn't expect this deal to get so hot. Thanks for the heat!
There will still be some stores with stock, call ahead before making a journey to save yourself the petrol :)