Thanks for the tip on their availability. I haven't read them all, but my Dad read them, and I sneaked a few of them off his shelf when I was a kid.
I'm in the middle on the pricing. I can't see pricing them at $3, but $12 for some of these is too steep for me. I buy mainly from B&N, and the ones over $8 sit in my Nook wish list indefinitely, while the ones less than that, I end up buying. I've got 25 or so titles sitting in the B&N wish list now, all over $8 - I hope B&N is watching
At $8, I'll cherry-pick, at $5 I'd probably buy them all.