Luckily I still have 600 acorns from the contracts etc in the game, I only spent a few which took me from 600+ to 590 so hopefully I have enough to buy the track packs as I'm sure not buying acorns at the price they are listed for on the store - a whole DLC costs roughly the same as (off the top of my head) 100 acorns from the store which is ludicrous