I went through this a few weeks back...doing bulk research i think the cheapest locally available rim would be the GMAX Drift6, which EVOR sell for $750 a set. They are ~8kg a rim.

Next option would be the Enkei RPF1, which is also around ~8kg a rim. Price i got was ~1300 delivered with hub rings. This quote was from Gerald @ Cheap Wheels Direct.

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hello my name is tommy
i don't have a Subaru