There is quite a big tile supplier near PJ Old Town. It's located slightly further down from Campbell factory if you're coming from the Jln 222 roundabout.
You might have some luck there.

Generally if you take in large quantities, the prices can be reduced dependent on the quantity required. The larger the quantity the more leverage you have for negotiation.

When you're on the road heading to Campbell factory from the Jln 222 roundabout, Campbell factory will be on the right. Continue straight on till you come to a left turn that heads to old town wet market, continue straight on and the shops on the right. They sell tiles from many major brands so don't worry.

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Added on January 7, 2012, 12:18 pmYou can try Niro Granite showroom in Seksyen 19. If you're coming from Jaya supermarket (Seksyen 14) at the traffic light at Seksyen 14 mosque, turn left. Go straight till you come to the traffic light turning right to Toyota showroom and 3 two square. Take the right turn passing entrance of Toyota and continue straight. Niro granites office is just pass the Vitagen factory on your right.

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Added on January 7, 2012, 12:21 pmGuocera factory is the right turn after Campbell factory but I'm not sure if they have a sales office there.

This post has been edited by adrianjc: Jan 7 2012, 12:21 PM