The Who Do You Think You Are Magazine (behind the popular genealogy TV series/documentary) is running a huge sale on back issues of the magazine through the iPad/iPhone/iPod touch Newsstand app for $0.99:
Who Do You Think You Are? – Immediate Media Company Limited – Apple iTunes Store
This is a huge sale – single issues normally sell for £4.99 / €5.49 / $6.99, with normal subscriptions costing £3.99 / €4.99 / $5.99 per month, or with a 1 year subscription, £44.99 / €49.99 / $64.99.
I believe the back issues stretch all the way back to April of 2012, at least going by what I see in Newsstand.
There is a also a free 1 month subscription trial, which includes the latest issue. The app itself is free.