If you ever want to get yourself a Suica, then you should go to Ueno. There are other places toget it, but that’s a place I know. When you get there, head for the central exit and then when you come through the barriers, go into the Shinkansen ticket office directly on your right. You can’t miss it. Once in there, wait in line and then tell the guy that you want a suica. You have to pay 2000 yen for one, but when you get it, 1500 yen goes toward credit for travel, so basically in costs 500 yen. You don’t get any discount for using it, but it just means that you can press it on the touch pad and walk though the barriers, without having to buy a ticket anymore, remember to keep it topped up, if you don’t, then just go to the barrier staff member and pay the difference when the barrier closes on you.
You can also use it to get a monthly pass for work, the longer in advance you pay, then the more your discount, however, it is only a marginal discount, but, why not?