I can't tell how big the Walmart human hair bands are, but I would guess they are too big.
Grooming bands are about 1/4 inch in diameter. I think they have some kind of coating on them that keeps them from tangling the fur too much. But usually people just cut them out.
The grooming bands come in packages with large numbers of bands in each package. I think I had two packages in my Maltese's whole life.
When he got older, I didn't do topknots very often--partly because I wasn't very good at it. More often I did a single ponytail with the smallest human terrycloth ponytail holder. 
Grooming bands are about 1/4 inch in diameter. I think they have some kind of coating on them that keeps them from tangling the fur too much. But usually people just cut them out.
The grooming bands come in packages with large numbers of bands in each package. I think I had two packages in my Maltese's whole life.