Usher DMD tweeter upgrade: worth it?

I see several people saying that this driver can be purchased for less than $200 from Taiwan.  Where can this be bought?  If I am going to experiment, I rather risk $200 than $700.

I live in Taiwan> I just contacted Usher here to replace my old tweeters on my cp-8571   they are not less than 100usd each here. they cost 12000ntd + the exchange of your old tweeters  (aprox 375usd)  also Usher will not sell the dmd tweeter unless it is a replacement

Does anybody who replaced their Usher Be tweeters still have them lying around? I'm looking for a nice used pair. Are these tweeters always the same? Or do they differ, depending on which speaker they were used in? I am going to use them in a pair of Mini Dancer II.  Thank you.

@hukkfinn
Yes.  I have a pair of Be tweeters taken from my Dancer Mini Ones.  They are the exact tweeter used in the original Mini Twos.  I will PM you to discuss farther.

I purchased my beryllium Usher CP 8571’s used back in May of 2014. I am very pleased with their performance. To complete a home theater set-up, I went in search of a local USA Usher dealer. The only one I could find was Fred at Katli Audio. From Fred I purchased a BE 616 DMD center and a pair of S 520’s as surrounds. Because the center channel had a DMD tweeter, I decided to purchase two DMD’s for the 8571’s to match. Fred had them in stock. Installation of the new tweeters was a snap. I too believe the DMD’s provide more detail than the beryllium tweets. On another note, playing a 5.1 SACD of the 1812 Overture at ludicrous volume proved too much for one of the S 520 woofers. Fred had one of those in stock too. Thank goodness for Fred. I’m genuinely surprised there aren’t numerous Usher dealers here in the US.