Yes, such thing exists.
My friend just had an endoscopy & colonoscopy together. She was able to get a price estimate through her hospital's portal both with and without her insurance, prior to her procedures, requiring no special interaction besides picking the service she was interested in and if she wanted to see the price with or without insurance.
The system seem to show her anything and everything she needed, from a routine office visit, these procedures, to delivering a baby. It not only includes the price at that facility but also a range from low to high, and where the facility fits. It also gives breakdown of the fees, although not deep enough.
The service seems to be by a company called Epic (www.epic.com), based in Wisconsin.