Rakuten (formerly Ebates) has some nice Cyber Monday cashback specials. I didn't spend much time going through the fine print on each offer, so please do before jumping. If you don't have a Rakuten account yet, grab a referral from the referral link thread for an additional $10 bonus to your cashback account.
Mint Mobile: Not quite as good as the one-day Black Friday offer, but $30 cashback on Mint Mobile SIM. (Stack with the $45 promo)
Tracfone, Simple Mobile, Total Wireless, and likely the other Tracfone companies, 15% cashback. (I think the highest we've seen in a year.)
QVC, 15% cashback-- pair with one of the $50-$60 Tracfone bundles (phone + year/1500/1500/1.5gb)
HSN: 7% cashback-- as above with Tracfone bundles
Motorola Mobility: 15% cashback-- pair with one of the phones that's been on sale for a while.
Bonus cashback for lots of other stores, too-- I've looked at cellphone related only.