From:
http://www.chasingthepoints.com/2013...k-vendors.html
Gristede's - $25 max
Kmart - $50 max
Wholefoods - $100 max
Walmart - [max unknown]
A&P - $50 max
CVS - [max unknown]
Post Office - $50 max (does not work with any Visa Buxx card I tried, so this is good for those that use a regular debit card)
For Sam's Club and Discover it is because:
https://www.discover.com/credit-card...CASH_CASH_CKOT