I've looked all over Amazon, but I'm not confident that the ones there will provide a clean lossless transfer...anyone have any suggestions?

How lossless can S-Video be anyway? Head to www.monoprice.com or www.partsexpress.com to check for what you need.

www.Calrad.com

cables, baluns, switchers, scalers , connectors, power supplies, etc.

In-house stock, in Hollywood, Cal, easy to deal with and good prices.

They have been around for 30 +years and doing quite well.