Usually on line resources are more expensive than local nurseries. They just have a much larger inventory and plants that are hard to find in nurseries. Encore are patented plants so you pay a premium for them anywhere. Here are some online sources:

$34.95 for 3 gallon plants at Sooners

Priceless at Teas

Priceless at Pender

I bought Wisteria from this company last fall, and I know they carry encore azaleas and I think the one you're looking for is on there. Not sure what your idea of a well priced, large plant would be but you could start here at least.

Thanks very much to both of you. I'll be sure to check these out.