If you dont have gears, get those before anything else!!!!!!!!!
However if you get gears, you may also need the install kit which includes carrier shims, and some bearing replacements, etc. (whether you need this or not depends on the mileage on your car, i think 75k+ is the reccomended cut off). Plus you will need to install the gears, 200-250 usually. Usually not recommended to install yourself, however it has been done.
other cheapies-
Strut tower brace
underdrive pullies $99
Mach 1 pedal kit (very nice IMO) $75
Stainless steel bumper inserts (well worth the money) $60
C&L intake plenum $150
Billet interior pieces also make nice inexpensive gifts