Girlies,
I pressume your after navy shoes which are a pain in the arse to get. My airline has now said we can wear black shoes cause navy are difficult to get hold off!!
I got my last navy shoes from Next, really comfy, low healed and only £20....that was a few months ago though. You can try Empire.co.uk they have loads of low healed court shoes in black or navy...again only about 20 quid
Good luck with you mission