Barnes and Noble, and Borders, are both bookstores with a huge variety and good prices.
Barnes and Noble's and Waldenbooks
In a lot of good christian music/book stores in the alternative section, over the internet & in some good music stores as well.
Spanish for dummies is a good book. There are also multiple good books out there to learn Spanish that you can find at most book stores, including Chapters.
There are many places where you can find the Twilight book series, especially since it has become quite poplar. Book stores, some department stores, some drug stores, and online stores such as Amazon.com carry it.
There are a lot of party supplies stores, it depend on what area you live in, you either check with your local phone book, or online, to locate the one close to you, here is some, partycity.com
Comic conventions good sources of original comic book art. Other possible sources are the artists' personal websites and some comic book stores which specialize in such material.
Some good and some bad.
you can get it from all good book stores even Asda
In Waterstones, possibly WH Smith, Amazon.co.uk and other good book stores.
depending on where you live there are different stores but i recommend barns and nobles
Some good stores include O'Reilys AutoZone or any certified mechanic or car shop which has good ratings. Try comparing stores based on reviews you find online.
Try submitting your book to local schools, local book stores and libraries. First get some recognition. Try selling your book to stores on consignment. Sell your book on eBay. Talk to te local papers.