Have you tried the YT sister site MalteseTalk.com? You might get more information on Maltese breeders there>
I have to second the idea that you will have a hard time finding one from a good breeder for $800 unless they are just cheaper in the UK.
I do love my Buttons and he has the sweetest temperament but his beauty comes with high maintenance, even more than a full coat Yorkie if you can believe it