You can tie your own using mono. Just take a loop of mono and lay it along side the line, then slip a tag end over your line and through the loop 3 or 4 times, pull tight on both ends then trim. I know this doesn't sound right but it works and you can slide it up or down. I usually use a different color of mono for the bobber stop so you can see it better. If your bobber has a large hole you will have to use a glass bead.