Club Carlson, the hotel chain that includes the Radisson hotels, the Park Plaza, and Country Inn & Suites (honestly, I've never stayed in any of these properties before but diversifying is what it's all about, especially when the points are this easy to get).
They have a promotion right now whereby if you complete your first transaction with any of their "Extras Partners," they'll give you 300 Club Carlson points. 3000 points gets you one-third of the way towards a category 1 stay.
This includes EBay Buy It Now purchases--so you buy something cheap for 99 cents, such as watch batteries from somewhere in Asia for example, and you'll qualify for the 3K points. The points get desposited 36 days after your purchase.
You'll need to download the Club Carlson App on your Android or Iphone, register and then use their app to go to EBay (for example) to complete an inexpensive purchase.
It's that easy!