There was a posting for this in Nov 2006 but Argos still have the shelly I can be bunches packs for £2.49 for 4 dolls.
Not really worth doing alone as postage is £5.95 as they are only available for delivery, but good if you are buying something else anyway. I ordered a bin that had been reduced and added 3 packs of the dolls for little extra Christmas presents.
Also a point to note is that the picture shows a fireman, teacher, nurse and baker but if you order more than one you might well get the other set too which is a sports pack, tennis player, swimming, karate and I can't remember the fourth! I got two of one set and one of the other.
I suppose if you did order 2 and they sent 2 the same you could always take it back to a store for refund.