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The best value for the price is Thesaurus packs, since the grab bag mostly has cards for the first couple sets.
I would mention the Storehouse, but I'm not sure where Schaef is with that whole setup. You could try to PM him.
By the way, the second part of my post was in relation to Thesaurus packs or non-mint cards, which I'm willing to sell pretty cheap (with a huge assortment of cards) since I need to make more space in my daughter's closet.