There have been a series of new offers for the Discover it® card in the past few days ranging from a $75 bonus up to, now, $150 cash back when you make $750 in purchases during your 1st three months from account opening.
You can also layer in the Discover 5% bonus category for Q4 2013, which is all online shopping, for up to $1500 in spend. So your initial $750 spend, if done online, will net you another $37.50 in cash back, bringing your total cash back to $187.50 (i.e. 25x).
Being the holiday season, etc., if you go ahead and do another $750 in online shopping (i.e. total $1500 in online spend), then your total cash back for $1500 in spend would be $225.https://www.discovercard.com/cardmembersvcs/acqs/app/display?pageFileId=listingsite&sc=KCV6