As noted, both air filters are easy to DIY. You can get it done without any tools, but a screwdriver helps for the engine filter (to pop the intake tube off the throttle body for extra play).
Ask for A-La-Carte pricing on the other services. From that list my 90K service will probably just be changing out the diff fluids, if I don't have them done before. Add that to the regular oil change and tire rotation and I'm right around $200 plus the cost of the filters I replace myself.