I’m still keeping an eye on prices and availability of key supplies to keep my firearms running and noticed that Prepography advertiser LuckyGunner has 42 Thermold AR-15 magazines in stock. They’re the 20 rounders and run $22 now (prices are still increasing a bit).
They also have 44 Magpul AR-15 30 round magazines as well. They’re selling for $44.50 now. Search on the LuckyGunner website for “Thermold AR-15”