Most vendors sell the "red" Prothanes for $80-$90. There is also a "black" kit available at
www.suspension.com for $72. The black mounts are not quite as dense as the reds, but still effective. I just installed the black mounts; had a machine shop press out the old mounts for $20. I'm not sure why you would want to do the mounts as a first mod, though. They are easier to do if you're doing major work like a head swap at the same time.
To change the tranny fluid, remove the fill bolt on the side of the transmission (17mm), then remove the drain bolt (22mm, I think) and let the fluid drain into a pan. Push the splash shield over so that the fluid doesn't get all over it. Replace the drain bolt. To add new fluid, it's helpful to have a funnel with a long tube attached to run into the fill hole from the top of the car. You can find these at most auto parts stores.