47-59 New Pistons for 59 GMC 270?

[SanJosesSteve]

At 158K miles, my 59 GMC engine needed a refresh. Machinist tore it all down and found each piston ring had at least 1 broken ring and wants to replace all the pistons. No new pistons to be found though. Got an estimate from a well known SoCal piston manufacturer for a whopping $2,500 a set. 1st time having an engine rebuilt. Just want a sanity check..... Does this sound about right? All the places I used to buy minor GMC engine parts are seemingly gone. Machinist offered a Plan B to clean up and re-use the old ones, but its not his first choice.

Any ideas on where I might find some NOS pistons hiding out.....? Does $2,500 seen right....? The full rebuild up until this morning was about $6K. Now looking at $8.5K unless I find some unicorns on a shelf. Thanks, -Steve