I bought one of the no-name rearview systems off e-bay for about $95.00 including shipping. My old b/w Weldex system had died. I ordered from a company in the US. Bench testing showed the system works perfectly and has good color and picture.
The down side is the cables do not match. I have located a source for the adapters. Vehicle Safety Supply has the adapters for $22.35 including shipping. Part numbers are: ADPT-46AE and ADPT-64AE. You need one of each. I spoke with people at VSS today when I ordered and will take about two weeks as they order from manufacturer (ECCO), who will not sell to public.