A couple of years back you couldn't find a sale price at all on the Dinan sport tuner I wanted. A friend suggested I wait until black Friday and check Xph. That's where he'd gotten his on sale the year before. It turns out he was right. I saved almost $50 that day.
https://x-ph.com/dinantronics-sport-...-bmw-f-series/
The deals are out there for sure.