You can put iRacing dollars/credits on your account in advance if there's a reason to set that money aside now, I'm assuming once it's on the account you can also get the bulk discount.
I figure the most economical route is $15 each for 7 tracks is $105, which will be $84 with the bulk discount, and the skip is $12, so if you take the $100-for-$75 discount they have running right now, you actually end up with 7 tracks and the car for $69 (6 dollars left as credits). Which is nearly the entire season. Or if you own the skip, 8 tracks for $72ish. Or if you want the skip now to practice up, a couple dollars less since it's not part of the bulk purchase.
Seems like a reasonable deal if you can make it happen. Though I'm still kinda hesitant to spend $75 for one series worth content, I guess I'm not used to iRacing finances yet.