Amex is rolling out a new wave of deals, including one for Dell that is better than ever. Under this promo, you’ll receive a one-time $150 statement credit when you spend $599 or more at Dell.com by December 31, 2012. To receive your credit, you must first register for the promo, then make an eligible purchase with your registered American Express card. You can register for this promo either through Twitter using hashtag #AmexDellOffer (details here), through the American Express iOS app, or by logging into your American Express account online under the “My Offers” tab.

There are also a number of other deals currently active:

BaubleBar
Get a one-time $10 credit when you spend $50 or more online at BaubleBar.com by 3/1/13. Register through Facebook or Twitter using hashtag #AmexBaubleBarOffer. Read Twitter offer terms here.

Best Buy
Get a one-time $20 credit after spending $200 or more online or in store at Best Buy by 12/31/12. Register through Facebook, your American Express account online, or Twitter using hashtag #AmexBestBuyOffer. Read Twitter offer terms here.

California Pizza Kitchen
Get a one-time $10 credit after spending $25 or more in-store at California Pizza Kitchen by 12/31/12. Register through Facebook, your American Express account online or Twitter using hashtag #AmexCPKOffer. Read Twitter offer terms here.

Coffee Bean & Tea Leaf
Get a one-time $5 credit after making a single in-store purchase of $20 or more at a participating California or Arizona Coffee Bean & Tea Leaf location by 12/31/12. Register through Twitter using hashtag #AmexCoffeeBeanOffer. Read Twitter offer terms here.

The Container Store
Get a one-time $5 credit when you spend $25 or more in-store at The Container Store or online at ContainerStore.com by 12/4/12. Register through Facebook, your American Express account online or Twitter using hashtag #AmexContainerStoreOffer. Read Twitter offer terms here.

Eastern Mountain Sports
Get $25 each time you spend $150 or more in-store at Eastern Mountain Sports by 2/23/13. Register through Twitter using hashtag #AmexEMSOffer. Read Twitter offer terms here.

HSN.com
Get a one-time $10 credit when you spend $10 or more online at hsn.com by 2/28/13. Register through your American Express account online.

Philippe NY
Get a one-time $75 credit when you spend $250 or more at Philippe NY by 1/31/13. Register through Twitter using hashtag #AmexPhilippeNYOffer. Read Twitter offer terms here.

skyauction.com
Get a one-time $50 credit when you spend $100 or more in a single transaction at skyauction.com by 12/4/12. Register through Facebook or Twitter using hashtag #AmexSkyAuctionOffer. Read Twitter offer terms here.

Sony
Get a one-time $25 credit after spending $100 or more in-store at Sony or online at sony.com by 2/23/2013. Register either through Facebook, your American Express account online or Twitter using hashtag #AmexSonyOffer. Read Twitter offer terms here.

Warby Parker
Get a one-time $10 credit when you spend $95 or more in-store at Warby Parker or online at WarbyParker.com by 3/31/13. Register through Facebook, your American Express account online or Twitter using hashtag #AmexWarby. Read Twitter offer terms here.

YogaWorks
Get a one-time $20 credit when you spend $100 or more in-store at a participating YogaWorks by 12/14/12. Register through your American Express account online or Twitter using hashtag #AmexYogaWorksOffer. Read Twitter offer terms here.

Zarin Fabrics
Get a one-time $80 credit when you spend $400 or more in-store at Zarin Fabrics by 12/6/12. Register through Twitter using hashtag #AmexZarinFabricOffer. Read Twitter offer terms here.