I thought I had seen Bioshock 2 and Mass Effect 2 in the marketplace for download not to long ago (1-2 months?) but when I went to purchase them they were gone, only the trials or ability to rate them are there. I've noticed this will other games too. Why is that? It looks like they are available for a period of time then pulled.
I don't like having to buy retail boxes because they take up space and I have to swap out the disks. If I mistakenly thought they had been for sale+download, is there anyway to know when they will be available in Games on Demand?