a) Freeride goes for longer and stiffer board, so also stiffer bindings and boots as well.
b) I'm not too sure about Morrow bindings (if they are cheap companies like Lamar, 247, etc; someone else may be better to point this one out), but a lot of bindings and snowboard equipment are getting discount around this time of the year (mid to late season), 40% to 50% or more, gets cheaper as time goes by, as shops are trying to clear out their inventory.
Bindings do last a really long time, big chunk of metal and hard plastic, I've been told to invest in this, as they can last longer than your board and can be swapped out to a new one. I'm thinking $75 and up with discounts. I think a few weeks ago on Sierra Snowboard they had %50 off bindings and had the Union Force (a really good set of bindings and well regarded on these forums) for $100. Rome Arsenals are also really good freeride bindings.
Go to your local shop and ask, you'll learn a lot about bindings and other stuff too. They might price match something if you find it cheaper else where, too.