Kid to Kid is a great place to find (mostly) gently used children's toys and clothing.
I bring a lot of my daughter's clothes here when she outgrows them. They don't give you a lot of cash or store credit for the items, but I like to get the credit for toy purchases. Toys are extremely cheap here at this store.
To give you an idea of prices:
Yesterday I found (but did not purchase) a toddler Ariel doll which goes between $16 and $25 retail at Target, Costco or The Disney Store. It was very new (these just came out several months ago) and was going for $5.99 at Kid to Kid. I have found a lot of My Little Pony toys here in the past. They usually have 3-5 in a bag for $3.99 or $4.99. I purchased a kid's tool bench and a washing machine for $13.99 each last year. I got a Duplo table for $27.99.
Honestly I prefer bringing clothes to Turnstyle for consignment than here because you usually end up getting more money for your items. Of course, Kid to Kid gives you instant gratification by buying your items upfront and not consigning them like Turnstyle.
NOTE: If you decide to sell to Kid to Kid or buy from them, make sure to sign up for their email list. Sometimes they send coupons for 20% off an entire bag of clothing or toys. They also offer $10 off $30 coupons every once in awhile. You can also find coupons in the Entertainment Book.