These should set you on the right track:
BLACK MUSK KASTURI ATTAR PERFUME OIL - 3ML | eBay
The seller in the link following the quotes probably has the best real musk I’ve tried but it is an exceptionally strong and distinctive scent that can be difficult to wear widely. If you can stand sleeping on it, I would suggest applying the night before to give it a few hours to mellow-down and merge with your natural sig - That is when it works best. 
From the first link Paradise is about the ost competitive but remember it is only the ASAQ and Highest grade Arabian Oud musks that contain the real thing - Although they do occasionally auction vials of pure Kashmiri deer musk, which would be suitable for adding to your own mixes in tiny quantities. There generally go for far less than the same thing at Agarscents.