I don't know why that would be B00, maybe you can only use one offer at once.
I know the buy one get one free PJs offer has been running a couple of weeks now, the 70% off is a pre sale code that I was emailed this morning.
It may also only apply to the stuff on the page I linked knowing Boux Avenue. :-/
I usually do my shopping by using a discount voucher on my orders. This is one of the website that I've been regular checking for codes. Hope that will help you out. Media URL: http://freedeliverydeal.co.uk Description: