well good online music production stores are

http://www.dv247.com

+

http://www.turnkey.co.uk/tkweb/index.jsp

+

http://www.dolphinmusic.co.uk/


i generally check all 3 when buying something new and go for the best price. also dont be afraid to phone one up and attempt to get a price down if its cheaper somewere else cos a lot of the time they will undercut a price youve seen online over the phone :)