Almost exclusively from Doctor of Credit (my links were to his blog). I'm subscribed to his RSS feed.
If you want to easily meet min spend requirements, google manufactured spending (MS). There's an entire world of MSing out there.
Short of buying visa/amex prepaid cards, are there still reliable MS options out there? (without jumping through hoops or arbitraging gift card resale values)
I have $1000 to spend in order to meet AmEx requirements (in order to receive 50K points, or $500 worth in store gift cards, yesss).
rgregory, if you like cash bonuses I can tell you that I would recommend Chase aarp, BoA bankamericad, discover it, capital one's flagship card and citi dbl cash.
DoC will also usually tell you if your offer is a good one historically, or you can always google "Name of card sign up bonus" to see what past bonuses have posted. Some other group, maybe magnify money, has also found that bonus sign ups are lowest in Jan and rise in May, then in the late Fall.