did you check the internet for online vendors? If you live somewhat close to a major city, I would assume there would be many options for overnight delivery. Since the pandemic started, many places offer delivery service that never offered before.
Personally I also use local online classifieds as much as possible. Again, If you are near a major city, there should be some local reef websites for hobbyists, even kijiji works. Here you can find people getting our of the hobby and selling their live sand and rocks, you can also post an add asking to buy a cupful of their sand, I've seen adds like that before. And of course its a great way to get cheap frags. I also like it cause I get to meet like-minded hobbyists, before the pandemic we could show each other our tanks, but now its all curbside.
In this hobby I would suggest to rely on your LFS as little as possible, just my 2 cents. Good luck