if you live in London I recommend going down to Bangingtunes in Little Portland Street, Upper Regents Street, WC1 - their website is 3-4 weeks behind their shop with releases (website Powertools 17 is only on pre-order when 18 is already out!!!)

Mad Records off Lexington Street, Soho is really good too - bloke who runs it really knows his tunes.

Trackheads/Access-All-Areas in Kentish Town has stuff on the shelves now that Banging Tunes still has it under the counter on promo (Powertools 18, SUF70 and Raw 22 for example)