if online, kitbag.com. Contact nimrod2, he's doing bulk order from there.

Al-Ikhsan Bukit Bintang Plaza, or any of their branches nationwide.

If you are looking for Adidas kits, the one in MVMM has a good variety of kids sizes and kits, esp for the new Liverpool and Chelsea home kits.  Smallest is XS i.e. 7-8 years, IINM.  Good luck!

Deco 20 is a Chelsea player, but it looks like that he will be leaving the club soon.  Thus putting Deco 20 on a Chelsea 10/11 home kit would look strange.

My opinion is to call up Al-Ikhsan BBP first (03-21439010) and ask if the kit is available in your friend's son size or not.  If not, head over to Adidas @ MVMM to get it, before applying the name onto the kit @ Al-Ikhsan BBP.  Suggest to your friend that for smaller size kits, big and long names may look ill-fitting, and go for the shorter names i.e. Lampard 8, Essien 5, etc.