I paid I think $120-$130, somewhere in that range, for MLB.tv, however I need to pay an additional $15 to get it on my Android phone and an additional $15 to get it on my iPad. However on Roku I pay no additional cost for the app, and on the web I pay no additional cost.
I bought the iPad app because I felt I would be more likely to use it, when laying in bed and such. On the phone I would probably only use it in rare situations and so it's just not worth it for me.
Is any one aware of another subscription that has this type of price model?