dao is way too expensive and yahoo auction listings dont come up often enough
thankfully that is far from the only option
go to
DigiKey Corp. | Electronic Components Distributor | United States Home Page
search for v-10g-1c24-k
the omrons in the konami ascs are v-10-1a4 but dont worry about getting the exact same switch
there are many variations on the switch where the differences are as small as the style of the connector lines and such so it isnt essential to get the exact same switch as in a konami asc or an arcade machine
digikey does have
a listing on the original swtich but it is out of stock and minimum order quantity is one hundred switches
i was able to order twenty of the 1c24 switches and they arrived in a few days
popped one into a dead key of my konami asc and it works perfectly