Sourcing first aid supplies is not, in and of itself, particularly difficult. There will be many places that sell fully stocked kits for any purpose, whether that is for medical emergency services or even simply for small workplaces to ensure they are prepared. However, it is often a great deal harder to find very specific items, and even to be able to buy the right individual items at the right prices.
Many businesses or institutions will simply buy all of their supplies from a very generic place, and one that does not offer the necessary range both in terms of products and in terms of how those products can be bought.
First aid kits tend to be generic and, as such, it can often be far more sensible for those who need them to source items separately to make up their own kit. Whilst a certain percentage of pre-hospital emergency help will not have any need for items such as stethoscopes, others will very much need them and being able to buy such items separately to add to a bespoke kit is likely to be extremely important.
It is also important that these kits can be topped up with first aid equipment and supplies as and when they are needed as opposed to waiting until a kit has sufficiently depleted before buying another. Not only will this be easy when visiting very dedicated emergency supply companies, but it will also be easy to find many such items in clearance sales, making the cost of staying completely prepared even lower for you.
From glucose to surgical clothing, different organisations will need very different supplies and very different ways of sourcing specific items. Therefore, the best way to do it will always be through a company who allows as much freedom as possible in allowing you to get only what you need.