Be sure to look at the stickies, they have a lot of info that you will find helpful.

If you are doing things on a budget you may end up with something like this:
Badger Brush - $30
Razor (Pre Honed)- $60
Strop - $30
Cheap Soap and Misc Supplies - $20
TOTAL: $150

With the above straight set your cost is going to be about $50 a year for maintenance and new supplies.

That being said, the total cost is much cheaper then disposables in the long run. If you use one disposable cartridge every week that is about $170 a year.

WARNING! A lot of people see straights as a hobby and spend quite a bit more money, YOU HAVE BEEN WARNED!!!