Do you have any links to these companies? I need the zip fixing on a Salomon race vest - typical - 50c zip on a €140 piece of kit. I emailed Salomon who told me to take it to the shop with proof of purchase! It was a present, bought online by parents in the UK - I live in France, 50km from the nearest town anyway! I'm happy to pay, just want stuff to stop falling out during ultras - holding it together with safety pins at the moment!
Try your local dry cleaner, they can probably point you to a seamstress doing alterations and repairs. Failing that look in the local paper or your supermarket classified ad's board.
jk