Why do These Cylinder heads Never show up for Sale??

Hi everyone, For magnum engines (if you don't drill the hole in the block for LA oiling) there is limited cylinder heads available that are worth the price. You got the Eddy heads, old EQ heads and R/t heads (if you can find them). The one cylinder head that I never see for sale is the aluminum version of the magnum cylinder head part number p4876624 (Pic below).


How come these heads never show up for sale? Even R/t heads and the other heads mentioned above show up on the forum, facebook, or ebay from time to time.

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Kinda crazy yearone has this for sale and the listing is for one head correct ?