Hey all,

I am looking for a bulletin board that's reasonably simple to run,
free or cheap (less than $200 a year), and is an alternative to this
service.

ie. a forum where someone can post a topic, (a question) someone else
can answer it, accept the answer and the moderator can keep track of
who answered what and how many posts they have answered.

the rating of answers, setting a price for your post etc. is not required.

The aim is to attribute credit to who helps out on a tech forum.

I'm not sure I get what you're asking, but I for one can highly
recommend Invision Powers Services' Invision Power Board
(www.invisionpower.com). You can buy a yearly license for $70/year or
a perpetual license for $180. Once again, I'm not entirely sure I get
what you're saying, but that should help.