Do y'all sell shoe strings?

Yes

Yes we do. In many styles, colors, lengths, manufacturers. It is widely mis-reported that shoelaces were invented by Harvey Kennedy on 27th March 1790. This date is centuries after shoelaces were in common use and is clearly incorrect. Perhaps Harvey invented a particular type of shoelace, but he did not "invent shoelaces". Nobody really knows when shoelaces were invented, but they were in use long before that. Oh, and one last thing. There is a way to tie your shoelaces better and more quickly than you probably do now. Its called the "two loop shoelace knot" and you can see how to do it here: https://www.fieggen.com/shoelace/twoloopknot.htm

Yes they carry many sizes and styles.

Yes they do