Hi , i wanna subscribe to magazines cheaply .?!

Hi , i wanna subscribe to magazines cheaply .?

hi , I wanna subscribe cheaply to magazines like womans day , womens health , prevention , cosmopolitan .
On their direct website , on a one year subscription it works out cheaper , but since I am a student , i wanna look at things cheaply available .
But , on ebay , theses subscriptions are half priced compared to regular website yearly subscription prices , I HOPE THERE IS NO CATCH ANYWHERE , are they the real monthly magazines issued every month or are they previous years magazines which will be sent to me by ebay , is it safe to put our card number and if it really cheap , why do people buy in their regular website ,
pls reply .....

if you go to a drug store and buy a mazagine there is usally these little cards with special deals you just have to fill them out and send them to the adress on the back...they bill you latewr. I once got a subscription to cosmogirl (which i like 30 -40$ for a one a year subscription) for only 8 dollars for 8 issues just because of that little card.