Where to buy 351w lower GT40 intake??

I've seen on the threads where the price of a 351w lower GT40 intake is $309, but I can't seem to actually find it anywhere that cheap

Lowest I've seen is $369, past that it's $399 or up! I'd love to find a used one but have not idea what vehicles they came on stock... If anyone know the answer to that please let me know!!

I've also been watching Ebay and I've only seen the Upper & Lower as a pair and selling price was over $400. So where can this $309 version be hiding??

Thanks!

I know we have a lot of great Mustang Brian Muscle out there. I've read many fantastic posts and responses in our Forums. I'm hoping one you intelligent folks out there knows the "sweet spot" for buying this intake??