, welcome to Glock Talk.
A good place for the latest information on reputable sources and pricing for scarce Glock factory mags that come in stock is the Sticky thread at the top of this forum (General Glocking). Follow along here: MERGED Buyer Intel for Glock Magazines
I've seen the Red White and Blue brand offered at Galati International
, but I've never bought one to evaluate (45ACP in my case), nor have I read any reports from GT members on that particular vendor. It is almost certainly foreign made (most likely S. Korean) and imported into the USA for distribution domestically under various brand names.
If there is a factory mag alternative, which there is in your case, you will always be better off buying the factory product for reliability, quality and durability. If you decide to take a chance on a foreign knockoff mag, my advice is to buy only one and give it a thorough testing in your pistol. Don't expect too much. I've tested various aftermarket vendors for high-cap 45ACP mags and found suppliers that distribute a reliable product with a high quality mag spring, but the mags usually need mods such as different floorplates to make them durable in drop tests.