If the Redcard allows stuff to be bought on Wednesday, then I'm in for as many MSP cards as they'll let me buy. (Just kidding, I wouldn't buy more than a dozen)
If you plan on doing this I highly advise you to get your cards from another store. (IE Bestbuy, Walmart, Walgreens) just take the cards as they have no value and take them to the target you are planning on getting the points from. I only suggest this cause that's a lot of cards you will be taking away from others at that specific store.
Yes I know its kind of a grey area, but I have been told by fastcard in the past that this is what you should do if you come across no stock at another store.