Can I get cash back on prepaid Visa or MasterCard gift cards?

I bought $200 Visa and MasterCard prepaid gift cards at Staples ($400 total). They had a deal with a $15 rebate on each card, and the fees were $6.95 each, so I'm making a profit, plus I get 5% cash back on the credit card I used for the purchase.

I want to know if there is a way to get cash back from these cards. I would rather pay by credit card where I usually get at least 2% cash back (depending on the card used and what I buy with it). I don't want to get the cash back at an ATM or bank, because even if it was allowed, I'm sure there would be a large fee. If I have to I'll just use it on purchases and bills that I would pay anyway.

I know at Target when I use my Red Card (which is a Target debit card linked to my checking account), I can get cash back up to $40 with my purchase. Would that work with one of these prepaid cards? Then I could go to the supermarket and spend 20 cents or so on a banana and get $40 cash back. The customer service desk at my local supermarket (Pathmark) said that I wouldn't be able to do that. Would this work at any other supermarkets, Target, Walmart, anywhere else?