Reply to "Rheostats to control three trolley lines on my layout"

I think GRJ was accounting for shipping which brings it up to $26.

In any case that's a great price for "power."  I use the metric of $/Watt and look for 10 cents per Watt (or less) for fixed output converters whether AC or DC.

So the 450W ATX is less than 5 cents per Watt.  A 90W laptop charger is less than 10 cents per Watt.  A typical AC brick from a train manufacturer might be 50 cents to $1 per Watt. 

Likewise, when you regulate/adjust/control the voltage, DC controllers are much less expensive than AC controllers.  So as I see it, if your trolley, engine, layout accessory, lighting, whatever can operate on DC, that's the way to go.  My 2 cents.