Hi,
I have 5 aftermarket parts for this kit. I have to say that the Eduard PE set is the most impressive. Many, many parts. Some look like they shrunk the actual part to scale. I got mine from e-bay. I think Models by Mickster has it too. He specializes in this kit and all aftermarket kits for it.
Here's a photogallery of the set:
http://www.eduard.cz/info/photos/u-boot-viic/?io_photos=27&io_page=1
Here's Models by Mickster's site:
http://www.modelsbymickster.com/cgi-bin/hobbyshop/hobbyshop.pl?inv=Uboote
Looks like he's got it for $32.99. That's even cheaper than what I paid for it. Good guy to work with.
Jess