matt is such an expert i can't imagine he wouldnt have a price guide for it, so after some looking i fell on this:
REZ / WHY WHY WHY - A1. REZ / B1. WHY WHY WHY (WASTED MIX) LABEL STATES: 'JUNIOR PROMOTIONAL TOOL' - JUNIOR BOYS OWN COLLECT - VERY LIMITED DJ PINK VINYL / SLEEVE / LABELS PROMO 12" (COLLECT 002P) (200 - 1000 COPIES?) (1992) CURRENT PRICE £50
http://www.bigscreensatellite.co.uk/rez.htm