It comes with a converter...it’s more expensive than the pen but the whole thing is less than $10.
Matthew wants one real bad...but I won’t let him use mine.
I think you should get him a Rotring Core...Swisher has ‘em on clearance for $10 with the converter.
They’re hideous (in a very cool, ugly sci-fi sort of way), bulletproof, and write very nicely.
Search their site for the code RO22460 when you get a minute.