One great place to purchase coloring books is bookstores, such as Borders. For other options, some convenience stores have them, as well as on line vendors.
One can buy Spongebob coloring books at Amazon. While at Amazon, one can look under the books section and search the key work "Spongebob." There it will give you a list of Spongebob coloring books where you can set the rating or the price of it.
One can buy dog coloring pages from many department stores. Coloring books can found rather cheaply at the local Dollar store in bundles of 2 or 3 for $1.
Ippy Art and Design has intricate coloring books for adults. They are pretty cool--you should check them out--just Google "Ippy Art and Design".
The best place to buy bulk coloring books is probably your local Dollar Tree. You can even order them in large quanitities on their website. Bulk coloring books can also be ordered from amazon.com.
Barnes and Noble, Zuily, Nordstrom, Amazon, and eBay all have Curious George toys. You could also keep an eye out in Target, K-Mart, and Walmart, as Curious George isn't big right now, you might find some gems.
I think you can buy some on bookstores near you...
For Disney princess coloring books online, one can buy them from the official Disney website or search third-party websites such as Ebay, Amazon, or Target.
you could find food coloring at jewel osco.
walmart or target.
Sally's Beauty Supply
walmart or brook-shires
At a grocery store.