Are you looking to buy, sell or trade?
300-700 USD
Unlikely
Yes
They're scary looking.
most any large gun store will have them.
Grips, magazines, sights.
Best left to a trained gunmsith
Check the markings on the slide, frame and grips.
frame, barrel, sights, grips
Do an internet search for Colt SAA grips and be prepared for dozens if not hundreds of hits.
The 132 came with plastic or wood grips. Some of the plastic grips had Checkering, however I do not believe the wood grips ever had checkering.
Take it to a gunsmith