The Japan single is probably the way to go:
https://www.discogs.com/Underworld-B...release/343065
It looks like Amazon actually has really cheap prices on this for used copies:
https://www.amazon.co.uk/d/CDs-Vinyl...42a0901e5e6ad9
If you want new, try the Discogs listing above, or here's another option:
http://www.musicstack.com/item/464007095
eBay doesn't appear to have any good prices.