Just so you know, the bit that says "also includes 3 cars and 8 tracks"... those cars/tracks are all part of the standard package, so you aren't getting anything that you'd normally have to pay extra for. Basic package is simply everything you need at Rookie level, i.e. the stuff at the bottom of this page
http://www.iracing.com/membership/
I'd go for the 'buy 1 get 2 free' offer, especially if you think you are likely to enjoy it and want to keep at it. The cheaper option will cost you more if you decide to renew...
A) "PR-INRACING" : $5 for 1-month + $30 for 3-months (if you renew) = $35 for 4 months
B) "PR-2FREE" : = $14 for 3-months