as far as im aware Deep Blue was due to be back in stock at some point before xmas as is BP as im waiting to grab a pack of each
as for similar, dont think there is anything similar to the BP, very unique, the Deep Blue however i havent tasted yet so cant comment on that but im sure relax has had some at some point so he may be able to help you
Also as for "more", BB have certain strains only given out as freebies and other limited release strains that are in stock for limited time only etc so site changes throughout the year with what it offers but if you drop the site an email the lads are very helpful with answering questions on their strains/freebies/limited releases etc etc
i.e. a while back they were giving out freebies with orders of Casey Jones from Devils Harvest i believe however it wasnt allowed to be a "sold" strain, only to be given out as freebies etc
, not sure what ones are in stock but if you click into the strains it will say in or out of stock etc
http://www.breedersboutique.co.uk/webshop/