Sushi is cheap enough around here that I have no need to make it anymore, but I used to make it all the time.
Any good fish monger should be able to get the fish you want.
The rice is the hardest part to get right IMO...it takes a bit of practice but eventually it will taste great.
I'm sure you can get everything you need
at this web site. Seems a bit pricey to me, but I'll post it anyways.
PM me if you have any questions regarding preperation and rolling.