Unless you make your own stock, Savage is the only place to get one. There are a few individuals who have handmade stocks (very nice, I must add) but no commercially available ones yet.
Do a search in the Axis/Edge part of the forum and you will find many trigger and stock modifications, some of which have been done, and some which are simply discussed.

I believe the coupon gets you the stock for approximately $40.00, but don't quote me on that price.

fgw_in_fla has a number of posts about his success with his 25-06 axis.

There is also a sticky about a trigger mod, shimming the trigger to remove side to side slop.

I hope this helps.