They are a little pricey, but then everything is at WDW!
The robes we had in our room were not the thick plush ones, they were the ones I believe made out of a less plush waffle-weave fabric. I believe I saw some very very nice robes in one of the shops, I think those are the ones to which you are referring.
They are comfy snuggy looking. I think they are top quality, and if you can afford $150 for each robe, then I say do it!
As far as cleaning services go, yes, the GF will wash those for you, and yes, they will charge you for that service. Dry cleaning and laundry services are not inexpensive, though. You will definitely pay a small fortune for the service.