Nice price. Best do your research on seller though.
http://cgi.ebay.co.uk/Casio-Men-G-SHOCK-FROGMAN-Solar-Diver-Xp-GF-8250-9D-/290561587890?pt=UK_Jewelery_Watches_Watches_MensWatches_GL&hash=item43a6d1fab2#ht_1571wt_942
Looks pukka to me.
http://cgi.ebay.co.uk/Casio-G-Shock-Riseman-GW-9200-/270738064137?pt=UK_Jewelery_Watches_Watches_MensWatches_GL&hash=item3f093f0309#ht_500wt_1156
Pretty hard to find in the UK at the moment..
http://cgi.ebay.co.uk/Casio-DW6900NB-7-White-G-Shock-Metallic-Eminem-UK-/250803389323?pt=UK_Jewelery_Watches_Watches_MensWatches_GL&hash=item3a650c038b#ht_2327wt_1139
not a bad price for a decent collaboration
http://cgi.ebay.co.uk/Globe-G-Shock-Watch-White-RECORDED-DELIVERY-/200595378823?pt=UK_Jewelery_Watches_Watches_MensWatches_GL&var=&hash=item746b4946c3#ht_3563wt_1139