As always, Amazon.com is a good place to buy stuff. If you have Amazon Prime that is free shipping. Otherwise, just spend $25 and you'll get free shipping. I would suggest picking up:
-$16, gives you a deck, three booster packs, a Machamp Prime, and another Nidoking line.
and then just get it with another one of those collections
Both will cost you $34, which is a solid price for two decks, six booster packs, two primes, and an additional six cards.