The best ways to find suppliers are:
1) Google, but you'll need to dig deep. Most real drop shipping suppliers usually don't rank well as they are notoriously awful at marketing and SEO
2) Contact the manufacturer and ask which wholesalers they use to distribute their products. There's a good chance some of these will drop ship.
3) Drop shipping directories like World Wide Brands. There are a lot of spammy, low-quality lists out there so I'd stick to these guys if you do go this route.
If you'd like to learn more, I've written a detailed eBook on eCommerce which includes an entire section on how to find and evaluate drop shipping suppliers. You can download it for free below:
http://www.ecommercefuel.com/profitable-ecommerce-ebook/
Also, I just finished a screencast on finding drop shipping suppliers which I'll be posting to my blog in the next few days.
Hope this helps, and best of luck!