Found <A target="_blank" HREF=http://www.bsc-contracts.co.uk/products_racor.php>BSC contracts</A> were a fair bit cheaper than asap when I bought one for last boat & actually had stock, compared with long wait from asap on the one I needed (which they did list).
Dave Crawford, Lymington, usually has some in stock so I expect most Marine Engineers either keep some or will order for you if you don't want to do mail order form ASAP.