Does anybody have an inexpensive (<$2 each) source for mini toggle and momentary switches with ~0.025" leads on 0.1" centers that fit well on solderless breadboards?

creakndale

 

Those prices may get met, but the terminals probably will not. One solution is to solder on lengths of solid conductor wire to the switch terminals and make the breadboard connections with them.

 

Have you thought of using DIP switches?

Grayhill and other manufacturers make quite a variety of such things.
http://www.grayhill.com/dipswitches/default.aspx

Various distributors like Mouser.com, Digikey.com, Jameco.com carry them.

Electronic Goldmine sells assortments of them quite cheaply:
http://www.goldmine-elec-products.com/products.asp?dept=1191
Be aware that Electronic Goldmine has a minimum $10 order.