Are they flat out failing, no picture with a failed lamp light illuminating, or just getting worn down, poor brightness? Does the product provide a timer to see how many hours you are getting from the lamp?
As for lamp price that is part and parcel of Runco ownership no different than having a Rolls Royce or Ferrari in the garage.
The dealer charges me $693 + $60.98 Tax for a total of $753.98. I change the bulb myself which is a snap. Just unscrew the screws on the side of the projector and replace the bulb casing. Then I reset the lamp hours to zero. I have to buy a bulb every 10 months because my projector is the main source for television in our downstairs family room. When I have called Runco about a year ago, I asked them what is the normal charge for a bulb and they were very vague, inferring that I would have to get that information from the dealer.
Ah.... Got it... I would definitely go with mprh39's dealer. I hope he responds and if he doesn't then I would get a list from Runco and start calling dealers around the country. Heck, you might find it for even less