The AudioTechnica large diaphragm mount (AT8441) works quite well as long as you don't turn the mic upside down.

--Ben

Here is a link for one for $36

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=41466&item=3741633027&rd=1

Sorry, wrong link! This is the right one (I HOpe)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=29948&item=3741856324&rd=1

that shockmount at ebay fits, but it's NOT the Neumann shockmount and you'd need to be careful (don't turn the mic upside down)

The Neumann EA1 Nickel is pretty expensive ($250)... but will hold the mic upside down...

I also have a TLM-103 and would also like the shockmount... and then I see a special edition mic that includes shockmount and aluminum case for $999 at Sweetwater,

While the regular edition (no shockmount included) goes for $979. That makes me think.. :? Not fair :x

I recently bought a couple of Peavey Studio Pro shock mounts when I was looking for a large, economical basket for Oktava ML-52 ribbons. I ended up selling one of the mics with a mount - see the pictures on eBAY

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=15198&item=3734759401

The shockmount came with a captive nut for securing the mic, but it was far too small for the Oktava mic. I was able to pop it out pretty easily with a small screwdriver and the hole where the nut went through was just a touch smaller than the thread on the base of the Oktava mic. A few minutes with a half-round file and I had a perfect fit. The basket will accomodate a 3-1/4" diametef mic body.

I have no idea if this will work for the Neumann, but found the mounts locally for only $25 each and the are far nicer than the usual binder-clip crap you get for cheap.

I don't have first hand experience, but I've heard that the MXL 990 shockmount makes a perfect shockmount for the TLM 103. I think these run for about $30.