Hey Lisa! So glad to hear they are helpful – it’s our favorite city!
It’s so sad that you can’t find it here! We recommend visiting “Madrid and Darracott” to buy some to take home! They have SO MUCH selection and we also did their vermut tasting which was AMAZING – highly recommend!
I actually JUST published a post about our favorite vermuterias this morning: https://nevertwofull.com/best-vermouth-bars-in-madrid/
And, I have a list of all our favorite tapas bars here: https://nevertwofull.com/best-tapas-bars-in-madrid-spain/

In terms of veroutherias, most of our favorites aren’t SUPER close to Retiro/Salamanca depending on what you consider close – you would have to walk 20-30 minutes or take the metro. We consider this “close” but you might not! On that post, “La Sastreria” is one of our favorite places for vermouth and it’s about 30 mins by walk or metro (so not super close, but it’s great!) You could also check out Bodega La Ardosa or Casa Camacho! Both are SUPER traditional and lively. They are “standing room only” kind of places. Ardosa has some really good, traditional tapas as well whereas camacho is more for drinking. La Sastreria has some snacks, but the focus there is vermouth. Sorry, I know those aren’t as close as you’re probably looking for but I don’t want to recommend anything we haven’t tried in that area!