Aren't stock wheels forged, which is what drives the price VS cast aluminum which is how most aftermarket wheels are made? I personally would be looking for a forged option. Every aftermarket wheel I have had almost always falls out of balance over time and never true up like a stock forged wheel.
Stock GM wheels are for sure not forged. As others have mentioned even GM OEM wheels are cast in China. In previous generations or model years there was time when they were cast in USA, but that manufacturing process has really become few and far between inside the states and has moved off-shore for even GM OEM wheels.
GM just drives up the price because their OEM wheels are still stamped "GM" on the back side of the spokes. Even the wheel manufacturers that are offering factory or OEM replica wheels; Most are cast in China
Most of the aftermarket wheel offerings from companies like DUB, Fuel, Niche, KMC, Status, etc. are all going to be cast in China and are arguably no better/different of quality construction and finish than OEM wheels to be honest.
A 22" x 9"/9.5" cast wheel whether it's from GM or some of the other aftermarket companies above is going to weigh 45 lbs. +/- with no tire.
There are a few wheel manufactures that offer a flow form forged wheel or "hybrid forged" wheel that combines the process of cast with some forged wheel barrels for a slightly stronger and lighter wheel than 100% cast construction. Of course these wheels are more expensive also.
There are companies that offer forged aluminum wheels for our trucks; They are significantly more expensive than a equivalent cast aluminum wheel. But also significantly lighter weight and stronger.
How much lighter? I have forged monoblock wheels from Rennen (in my profile pic) that are 24" x 10" and they weigh 36 lbs. per rim with no tire. That's almost 10 lbs. lighter than a 22" cast aluminum wheel and it's a larger wheel.