Retail?

Price for the item when new. Cannot list the current new price as often times the unit has gone through changes along with the price increases.
Straight forward answer it seems to me.

It’s hard to keep perspective on “Retail” when the likes of Nordost holds a yard sale like they’re doing today.

Retail price at time of its purchase. But if you wish, in the description feel free to state for what they currently retail. Otherwise you are just being deceiptful. You should not lie or deceive.

Some sellers are very sensitive if you ask the date of manufacture of a component.

That would make me wonder what else they wanted to hide.

That's it, it might be caveat emptor and all that, but there is something deceitful to the practice of listing current retail, rather than the retail at time the units was made. And absolutely nothing wrong with saying that now it costs more if you want to buy it new. I wonder what AGON's guidance is on the issue, or if they address it.