Update: Several--if not all--of these offers have expired.

[Update at 1:05 PM ET: I successfully snagged the Harrah's Las Vegas package the second the sale opened at 1:00:00 ET.

As I expected, the packages went fast! All the packages seem to be getting the "Sorry, this inventory is already on hold message." If you really want one, keep refreshing.

Update 2/24/14: Offer is dead!

Last week, American Express (possibly accidentally) offered its Business Gold Rewards Card with a 75k Membership Rewards sign up bonus after only $5k in spending in the first three months.

That's pretty incredible because:

Usually the card has no sign up bonus.
It had been offering only 50k Membership Rewards after $5k in spending.
Normally when it offers 75k Membership Rewards, it does so for only one or two days and requires $10k in spending to unlock the bonus.

That deal died, but two Business Gold offers have risen in its stead.

The current best deal is this offer for the Gold Delta SkyMiles® Credit Card from American Express

Earn 30K bonus miles after you make $1K in purchases on your new Card within your first 3 months and a $50 statement credit after you make a Delta purchase with your new Card within your first 3 months.
Earn As You Spend: Get 2X miles on Delta purchases and 1X miles for all other eligible dollars spent.
Check your first bag free on every Delta flight - that's a savings of up to $200 per round trip for a family of four.

Starwood Preferred Guest's Cash & Points redemptions are some of the best values in travel.

American Express Membership Rewards are valuable because of their ability to be transferred to dozens of partners. But they have a glaring weakness: they don't have a top-tier Star Alliance transfer partner--US Airways or United.

Membership Rewards can be transferred to Singapore, which is great because this is the only way to get into Singapore business or first class.

Membership Rewards can also be transferred to Aeroplan and ANA.

The 75k Membership Rewards bonus on the Business Gold Card from American Express Open is back until March 8 14 (according to the terms and conditions) if you can spend $10k in the next four months on the card according to Dan's Deals.

This is a great deal if you spend tons, or you manufacture tons of spend.

Several months ago, American Express had a very limited time offer of 70,000 bonus SkyMiles for signing up for the American Express Delta card. Delta miles aren't worth as much to me as miles from American, United, US Airways, Frontier, Southwest, Virgin America, or many other airlines, but 70,000 miles is a lot--especially since the normal bonus is 30,000 miles.

I jumped at the chance, and I was approved for the card.

Today I'll be going to restaurants to buy gift certificates with my American Express cards. I have five including those issued by American Express and those just processed by American Express--and issued by Citi and Bank of America.

I registered for Small Business Saturday last week RIGHT HERE. Registration is still open today. Try to register all your AMEXes, except your prepaid cards because those won't work. Then go to one or more small businesses with your card and make $25+ purchases.

Delta offers 1,500 MQM for one year Sky Club membership

According to this thread on FlyerTalk, Delta is offering elite qualifying miles for buying a Sky Club lounge membership. To take advantage, you must purchase a one or three year membership by December 31st.

You can choose between two additional free months on a one-year membership or 1,500 Medallion Qualification Miles (MQMs). MQMs are what Delta uses to calculate elite status.