Not free but $7 a year and excellent retention is news.individual.net.
It tends to be the one everyone uses that needs independent usenet
access.
http://news.individual.net/

Just checked and they give their retention times at
http://news.individual.net/hierarchies.php and for the rec.* hierarchy
which includes this group its 79 days but is not less than 65 days for
any group.

--
Tony

"It is hard enough to remember my opinions, without also remembering my
reasons for them"
- Friedrich Nietzsche