Every town has swimming pool/spa stores, but they are usually small shops located in out-of-the-way places. So if you don't own a pool or hot tub, they are the kind of place you'd never notice! Check your local yellow pages.
Now that I think about it, Minnesota may not have a lot of swimming pools (besides the indoor commercial-scale ones). But I'm sure you have spa/hot tub stores, and you can call and ask if they carry pool filter sand.
My axie is acting woerd he was a rescue as stated in a different post he got better and now seems to be deteriorating again...again all tank conditions are OK and as should be. He seems to have some black dapple like pattern under his bottom lip? Is that normal? And his two back feet have a little wierd growth? Almost? Tiny tiny tiny lump. His capillaries in his feathers also appear darker and more visible. Any help would be appreciated