The problem with buttons

Now I'm well aware that I can take buttons off a cardigan faster that I can sew them on so why, oh why, am I having such a hard time finding the buttons for my Acer cardigan?  I could buy all the ones I 'kinda' like and try them out but no, my head is convinced that only the perfect ones will do.  The hunt for The Buttons is on.

I've looked for vintage buttons on Etsy (if I see another modern replica advertised as antique or vintage on there I will scream); I've trawled eBay and Amazon.  I have found a few really good UK stores online (my favourite being Handmade & Vintage) but if anyone knows of any other stores (UK or abroad) that would really knock my socks off, please just drop me a message.