looking for windshields for 76' Barth Regal 30'
We are in Southern jBritish Columbia.
also wondering about approximate value of this motorhome? Can anyone help?

Did you try the forum SEARCH feature for either/both of your questions?
One thing you would have found is:
"I checked with Duncan Systems and Guardian and they both say that all Barth coaches from the early 70's to the late 90's should be he DW 731 for the driver side and DW 730 passenger side. Please let me know if we are wrong here. This would include all models including widebody Regency's which had a small glass strip to add the 6 inches for the widebody coach."
The glass was derived from windshield of Chevrolet Astro cabover truck.

As for value, again you need to use the SEARCH and also browse the SIGHTINGS and FOR SALE posting from the last couple years. If you go back too far, you would not be seeing current price trends.