the only way you can get internet without involving him would be through your own smart phone.....they are fairly cheap (I have a Galaxy note 2 with a BIG screen). If you don't do a lot of other data like watching movies and downloading music it will give you SR when you still need it.
the new Samsungs are fairly cheap and the screens are large. the library in your town would give you access also for a imited time daily.
yes, your son is thinking that you won't follow through, you are going to have that change shortly. I support you 100% you should know that, and you can always email me privately too.