I don't know how many people in the MMM community use this, but it's a great resource for finding deals online. You can set up alerts (similar to camelcamelcamel) so that you'll receive an email or text when something that interests you is on sale.
It's great, especially for bulk buying. I buy certain products (soap, etc) from Amazon on subscribe and save, and stock up whenever the price hits a certain low point. It's really useful, especially as prices on amazon, especially, fluctuate daily.