I think it is Rp75,000 per person. If you stay at Villa Sanggingan just down the street which is owned By Pak Neka, you qualify for free entry.

75,000 rp

I think you'll find that almost all of Arie Smit's paintings are in Neka Museum. For many of Arie's final years he was tended to by Neka and during the last decade or so of his rich life, Arie lived in Villa Sanggingan, just about 100 metres down the hill on Jalan Raya Sanggingan. Villa Sanggingan is also owned by Pak Neka who is the proprietor and chief collector of Neka Museum. For these reasons, Neka has most of Arie Smit's paintings on display in his museum. I hope that helps poxavier, even though I am late in responding. Cheers.