Originally Posted by pinniped
Yes, you can buy a farecard in the train station. I think it's $1.75 each way - you can load the card with $3.50 or $4 or whatever before you board the first train, eliminating the need to reload it at Comiskey, where there might be a line to use the card machine. (Someone correct me if my fare info is out of date!)
It is indeed $1.75 each way - may as well just load up with $3.50 at Midway when you leave. You may also have to insert your card again when you transfer to the red line, but it shouldn't cost you anything.
As long as you don't hang around US Cellular too long after the game it is totally safe.
And yes, tickets should be no problem to get.