Transmission Solenoid problems of the 2011 BMW 535

Ses light illuminated. Checked the obd2 system for a code. P-2763 is present. Troubleshooting for the issue revealed the orange tcc pressure control solenoid is malfunctioning. Zf will not sell the solenoid individually. They require the consumer to purchase a mechatronic unit. The orange solenoid is a scarce part to find locally in the u. S. Online prices are around $90. On the global market. These are not new solenoids. The mechatronic unit, overhauled is $1600 plus a core charge. Plus labor. My complaint is that zf will not support the 8hp transmission by selling the solenoid individually. Costing me several thousand dollars when a single part around $100 dollars will repair the transmission. Zf customer service informed me that I should source the part through a used parts dealer or local junk yard. I tried but no transmissions are available. I have been looking since may of 2019. I talked to BMW and Chrysler parts departments at my local dealers. The tell me they can only order the mechatronic unit.