Seems too good to be true, right?  Something for nothing?  I was in the local sporting goods store lately, thinking of getting a Forest Service tag so I could park in their areas without shelling out for a day pass every time.  Looking in the Site Guide booklet at the different varieties of passes available I came across:
"Annual Northwest Forest Pass Decal
One free per year
One decal may be issued
per Annual Northwest
Forest Pass for open
topped vehicle or
motorcycle."

So I went and got me a free sticker for my bike!  Although looking at the wording now, I think they were supposed to give me that in addition to a pass for my car.  Ooops, nobody tell 'em!
Anyway, if you're getting (or have gotten) a tag for your cage, you can get a free sticker for your bike, around here anyway.

An added note, the main Parks office seemed to be the only outlet around here that actually carried 'em.