Inter-club events maybe, might help to knock the costs down a bit.
My 2 cents is:
Timed track day, discounted, members only, once a year, run a comp, give prizes like shirts or hats.
group 1 unrego race cars
group 2 rego 4wd Turbo
group 3 rego RWD Turbo
group 4 rego NA
Texi (yes as yet I havent made one with a car yet)
Motakhana (ON GRASS)
Drags (if WSID cost to much to hire then lets do a unofficial member attack on a wendsday night, the benifit of this is if it rains we pay for nothing and organise another night)
Servicing days (get together for a BBQ and oil change, bleed brakes, minor maintenance type of stuff, and a Beer or a Scotch)
At some of these events we could have a swap meet to get rid of unwanted parts or pick up some bits and peices.