The best AprilAire prices I've seen are here: http://www.duvallheatcool.com/Aprilaire%20Humidifier%20Order%20Form.htm
Does anyone out there know a better price?
By the way Jay J, AprilAire sells a current sensing relay that goes around the lead to the furnace blower motor (no electrical connection required) so that the humidifier is turned on only when the blower is operating. It's kind of expensive and it is easy enough to wire in a regular relay.
I don't like those self-tapping needle valves either. I'll just tap into my soaker hose supply line.