Greg Guarino wrote:

I see that those are center-cutting. I'm trying to determine if that's
necessary for wood use. And the price for 1/2" is pretty eye-popping.

You do know that you can cut mortices with plain jane straight bits, right?
Easiest if most of the area is drilled out and just cleaned up with the
straight bit but they can do the whole thing. And there are numerous that
are pretty long.

If you just gotta have spiral, here are some that are - perhaps - a bit less
less eye-popping.
http://www.highlandwoodworking.com/J...outer-Bit.aspx

http://www.carbideprocessors.com/sea...bit&x =12&y=5

And, of course...
http://www.amazon.com/s/ref=nb_sb_ss...ral+router+bit