Show the youtube link.
Where can I buy a chess set similar to the one used in Lyons 1990?

If I recall correctly, the House of Staunton has a similar set, but I can't be certain.

Show the youtube link.
http://www.youtube.com/watch?v=VUqx5_EsZ1s
About 5 minutes in, it shows them playing in the tournament but I didn't watch it long enough to see if they ever gave a really good look at the pieces.

So far the only closeups are the top-down perspectives, and I really can't see the knight. With all that, it looks like a pretty standard set.

There's a slightly better view at the very start of this video.
EDIT: A better view of the black pieces also at 3:26, though slightly out of focus. Those two shots should be enough to identify a similar set, though.

If we accept that this is the same style set as used in the match, I'm not sure about finding a knight like that (1:41).
Looks to me as a nice and practical set, and with an open and breezy look on the board. I'm not a fan of the cluttered look.

I can't find a mention anywhere online of where the original set came from, though it wouldn't suprise me if all the championship sets come from Jacques of London after Fischer threw his hissy fit before the match with Spassky.
Also, I've examined the few good shots of the set as mentioned in my previous post, and compared it to a number of online shops. The closest design I can find is this set, which seems perfect except for the knights and the fact that it is plasic.

The 1990 set: rounder bishops and the knights look like they belong in the family with what FIDE uses nowadays. The king, queen, rook, and pawns look close to the old USCF standard.

Summing up, the 1990 set looks like a hybrid of what sets were and what they are now. If one is being really picky about details I'm not sure about finding a great match for it.
I prefer the look of a classical Stauton chess to modern sets. I am surprised that there a offical FIDE chess set. I would think FIDE could make money by putting their name on a chess set and calling it offical and using it in all their major tournaments and championships.

I'm a bit late to this thread, but the set they used in Lyon looks like it was a French set by a famous French maker called Chavet. Chavet is still around, and their sets still look almost identical to the 1990 set. You can Google Chavet to find online stores that carry Chavet sets, or try and pick one up on eBay.
The HoS set some people in this thread have mentioned looks more like a replica of the DGT Timeless set for their electronic boards. Similar style, and used often at FIDE tournaments, but I much prefer the Chavet knight...

FrankHelwig is right. Is a Chavet Chess. This set is very popular and FIDE aproved in 80-90. LInares Tournaments and Anand-Kasparov are playng with this same set.
Today is "Morize-Chavet" and you can find them in ebay fr.
Is not easy to find the set that you want , because Morize has made a similar new one with a slightly different Queen.
About Kasparov-Karpov WCC chess sets: dificult is to find a rare model of a Spanish chess Pieces used in Sevilla. I have this set, and what a set! A pearl in my collection
Kasparov - Karpov 1990 Lyons. It's on YouTube, can someone show me a link to purchase a set like this one. NOT the original one used in the actual match! Just something similar. Thanks a ton! Live long and open files!