There is a new remastered box set of Bowie albums from the mid-70s being released on Sept. 23. Some pretty amazing work and the remastered sound is supposed to be fantastic even if you have the older CDs. $120 from amazon:
https://www.amazon.com/Who-Can-1974-1976-12CD/dp/B01IRHZO4O/ref=sr_1_4?s=music&ie=UTF8&qid=1473949514&sr=1-4&keywords=david+bowie
https://www.amazon.com/Who-Can-1974-1976-12CD/dp/B01IRHZO4O/ref=sr_1_4?s=music&ie=UTF8&qid=1473949514&sr=1-4&keywords=david+bowie