i have seen dolls at walmart,target,toysrus,claires,justice,kmart,and at amazon and ebay
I found Toralei on yardsellr.com for a decent price: http://yardsellr.com/for_sale#!/new-monster-high-toralei-stripe-dol... $30.99 w/free shipping
I also found Abby, but she's a bit pricey @ $49.99 w/free shipping: http://yardsellr.com/for_sale#!/new-monster-high-abbey-bominable-do...
Ditto for Jackson ($41.99) & Rochelle ($49.99) on the same site. If you search for "Monster High" there's quite a few dolls that come up. Some good prices, some not so good.
There's tons of Black & White Frankies on Listia.com: http://www.listia.com/search?q=monster+high (and various other dolls)
If you're talking about strictly physical stores, but not online: The ones you said above, but also Walgreens and Rite Aid. I know that's random, but I always check. Mostly they're just the SS, or GB dolls.