I'm not sure if they're aquarium safe, but some places sell decorative sand and small gravel of many [natural and clown puke] colors very cheaply. My local dollar store sells sand that's the same shade as the tahitian moon sand and what looks like crushed lava rocks in 1/2 pound plastic bags. I think walmart and other big chain store does this too, but abit more expensive. Another one is the smallest package [I think 5lbs] of CaribSea Naturals sand in petco/petsmart for around 8usd after taxes; they have tahitian moon sand.
I'd just buy the tahitian moon sand, incase you might want to upgrade or add another nano tank.
Currently out of the hobby
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Forum lurking every now and then