Hi VVV,
Central Market is the most obvious place to look for blades. However, I'm of the opinion that the stuff you get there might be a tad overpriced sometimes.
Still, the shop upstairs has a good selection of keris and Malay pedang. It's owned by a Kelantanese man and you can get him to do silver fittings for your keris.
If you have time, you might want to check Ahmad Toko Antik, an antique shop in Kampung Baru (take the Putra Line train to the Kampung Baru station).
It's a bit out of the way and the place may look forbidding but it's one of KL's best kept secrets.
The owner has a good selection of keris and other Malay weapons, as well as keris fittings such as hilts and pendokok. A good friend recently got a nice Bugis keris for a good price.
I'd like to warn you though that the owner is a crusty old man and has his mood swings. On bad days, nothing seems to be for sale, but his price range is generally lower than the antique shops in the town centre
