There isn't any SP lefts in Malaysia right now. Cause after year '97. The Malaysian GOV imposed a law on assembling bikes for 150cc and below to be done inside of Malaysia thus affecting the sales of 150cc market ni Malaysia at that time, till now. Honda didn't want to so SP didn't make it to Malaysia, I guess. But Kawasaki KRR 150 is build here and other 150cc and below bikes such as the Mito 125 and the Aprillia RS 125 and RS50.
Since all NSR 150's are made in Thailand, there is only a few of them manage to reach Malaysia but with a higher price tag compare to RR. Used RR in Malaysia costs RM 4,000 That's like USD$ 1,000, cash. Of course there are alot of SP converts from RR.
Try Singapore, they've tonnes of SP owner there. You can see them everyday. Even beat-up NSR 150 SP are seen in Singapore. Poor SP's.