I have so far only found 1 SC-2 for under $100, but have found a few SC-1's for around $20 each. Does anybody know if these older controls are compatible with the Legacy system? I was thinking of using the SC-1's for my switches and the SC-2 to run accessories.
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They work, but really weak. They cannot handle the voltage surges of twin coil switch machines like NJI's. Thats why SC-2's were developed. For SC-1's to work correctly without frying in a high amp situation, you have to use them to fire a relay.
Its been a while since I had to remember their limitations. I'm sure GRJ can better explain their problems.
My advice is to keep looking for SC-2's
Yes, strongly advise against using SC1 for typical switches. The problem is, they us tiny TRIACs to control the outputs. I just got done repairing 2 for the second time that a user overloaded the outputs and blew the tiny TRIACs to pieces.
The SC-2 has high current relays.
Forum sponsor Trainz typically has tons of both. Heck, I just counted, I saw 3 under $50 and 3 more under $60 for used SC-2s.
Thanks, I was thinking the specs on the SC-1 were looking pretty weak. I will keep looking for SC-2's.
I have to sing with the chorus, the SC-1 is very limited in functionality and power handling. I lost count of all the triacs I've replaced in them, but it's a bunch. I actually haven't seen one come in for repair for a couple of years, so maybe people are finally retiring them. I believe I still have some in a box somewhere, I'd love to get $20 for them as I know I'll never use them. 
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