The GF Daily Deals typically skip Fri, Sat and Sun and start again on Mon (IF they have them at all). It's best to just keep checking this site from time to time. I find GF deals are usually posted by 3-5pm ET.
Also, you need to read recent posts in the GF deal threads as they often get posted before the OP is updated.
You can also follow GF on twitter as I think that's where the sales are often officially announced.
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