Ags vs. 'Eaters: For all the marbles and @ anybody: You can stream it using Playstation Vue's free trial. (It's an internet streaming service that competes with cable -- you don't need to own a Playstation to access its website.)
Go to
https://www.playstation.com/en-us/network/vue/channels/ and create an account, selecting the cheapest package that has ESPN2. It allows you to get your first week free before they start billing your credit card. From there you can either log in to their site to see channels or go to the ESPN website and log in with your Playstation password.
Re: the NCAA tournament, if you keep your subscription and pay I think $40 for March, you can get all 4 channels March Madness is on: CBS, TBS, TNT, and TRU. (CBS might be market dependent; check first.)
If you don't care about having every March Madness game you can go through a similar process on
www.sling.com instead that gives you ESPN2, TBS, and TNT for $20 I think.