I started playing badminton with the M300 and didn't know any better for a long time. Bought them locally at the rec center of Texas A&M University. On this forum I learned of the M2000 and ordered them from here http://www.badmintonwarehouse.com/Yonex_Shuttlecocks_s/35.htm for only USD $11 per can. That's only $2 more than a can of 300's. In my opinion, the M2000 is so much better than the M300 that I would pay double for them over 300's. So a mere $2 more per can for M2000's is a great value. It will be a great day when we see an advance on the M2000 plastic shuttles as big as the M2000 was over the M300.
If we play with plastic instead of feathers is purely in terms of durability of the birdie (hence the cost overall). The M2000 I concur (and everyone who tried it with me) is great in terms of flight etc but the plastic 'feathers' get deformed too fast and the flight is compromised. It also breaks more quickly than the M500G we usually use making it doubly not interesting. I still have 3-4 tubes at home which I must use in fact. There is no point keeping it. It is not currently available here and had to be imported.
I don't know why posters are saying that there is no yellow 2000. Yonex's website shows both yellow and white.
Source for Yellow Mavis 2000 Shuttlecocks In the U.S., a great source on yellow Mavis 2000 birds is from Badminton Warehouse in Naperville, Illinois. You can buy them for $11 USD per tube as seen here http://www.badmintonwarehouse.com/Yonex_Shuttlecocks_s/35.htm If you order over a $100 worth then you get free shipping as well. That is what I always do. Badminton Warehouse ships to Europe as well, but there is a $39.95 USD minimum shipping charge that covers a fairly large package so that amount of shipping cost might be ok if you spread that cost over say, at least a 10 tube order. See more details on shipping and other questions at the link below. http://www.badmintonwarehouse.com/BW_FAQs_s/85.htm