The thing is that there are betas on both freebsd8 and freebsd10 branches.
As far as I know, betas for each of these branches are generated each time a commit is done on any branch, thus there are betas for 1.8.2 that are not linked to any commit in the freebsd8's branch but that were triggered by a commit on the freebsd10's branch.
Providing betas form the
http://m0n0.ch/wall/beta.php page would require more than a link.