Any of the OE replacement discs from a reputable maker like Pagid etc will be absolutely fine, no need to pay rip off BMW prices for discs when they are probably made in China too.
eurocarparts.com is the best bet IMO.
Also you need to change pads with the discs and get new wear sensors.
E90 330i 6MT gone. E91 335i 6MT gone. AMG E63 Estate gone. M6GC current...