Borrowed from another site
Popular Science Magazine Subscription
1 year - 12 issues $4.00 (.33 cents per issue)
2 years - 24 issues $7.50 (.31 cents per issue) ($3.75/yr)
3 years - 36 issues $10.50 (.29 cents per issue)($3.50/yr)
Popular Science Deal: http://publicationstation.net/items/subscriptions/science-natur