Cheap international schools within Klang Valley?

I am interested in sending my 13 year old son to an International school. He's currently in a national school now but will get him to transfer after we find one. We're looking for a cheap one with a decent reputation. Preferably not more than RM25K for the first 3 years (I have two older children in university, by 3 years time our budget wouldn't need to be so tight anymore). Not those muslim international schools please, we are of Chinese race.
Also, my son achieved 4A's in UPSR. Do any international schools offer scholarships for such results?
Anyway, any help would be appreciated. Thanks in advance! :)

Any suggestions where I can enroll my children ages 13, 14 and 15. Maybe a semi private school as long as its not too expensive and or any DLP school near Selangor or Kuala Lumpur area? Thanks

What about trying a tuition centre for more personalised learning (because of their ages)

There are quite a lot of options including:

https://www.facebook.com/impactacademykl/http://discover.edu.my/
TNCC Educenter
Kurnia Academy
Inspirasi
Stars