Members of cashback sites may be able to undercut some deals, though don't assume it's the same deal: they can be structured differently, so check carefully.
To get it, you need to sign up via the cashback website, rather than directly with the provider. Cashback websites use affiliate links to generate revenue, so if they get paid when you sign up, you'll get paid.
Unfortunately, this cash is never guaranteed, as sometimes there are tracking issues. Plus, they won't pay out on top of our Blagged deals.