I always keep a 'folder' for places that advertise parts and such. I have no connection with this person nor have I purchased anything from him but you can try it as a resource.
http://www.ur4ll.net/I have purchased stuff from Alex, UR4LL, for a couple decades.. And have friends that have as well. He was one of the original pioneers of the surplus Russkie stuff. He has some nice switches as well. They have switched multiple kilowatts with ease.
Another good thing about buying from Alex is that you are supporting doctors whom do procedures and wellness for children in the Ukraine and elsewhere. His operation helps to fund this, and is a major reason I have supported him. Not to mention, his prices and customer service is really hard to beat. He sends you a tube that is damaged in shipping or doesn't work? OK. New tube on the way. No, don't worry about returning it.
Also, with the cheap price of the commie vac relays, a simple rotary switch will allow you to make a killer bandswitch with vac relays.
--Shane
KD6VXI