His shop works directly w/ D&W Performance, one of the 5 Garrett Master Distributors.
That housing on the 3071 w/ the 5bolt/t3 is a stainless steel housing and will cost up the ass. Other options listed on there aren’t even performance housings. They buy a lot of shit separately from Garrett for much cheaper than it would cost dealers and then throw them together themselves for greater options. They have the ability to do stuff like this because they pay an astronomical fee annually to Garrett to be exclusive Master Distributors.
Dealer’s like my friend have to pay $800 for a turbo when those distributors are paying $500. It sucks for smaller shops like his because the Master Distributors can always undercut him.
Regardless, with a $300-$600 budget, there is no need to be even acknowledge that option exists, and again (like I said) the 5 bolt is NOT available from Garrett w/ a T3 flange on the GT30 series unless you swap out the exhaust housing for a reworked or aftermarket one.
OP, I will let you know the price on that used GT28 when I hear back from him…