As low as $0.50/pc!
Select desired gauge from the drop-down menu
Glass, 2 o-rings
Please note that the cork is removable, so you'll want to occasionally press it in to ensure it doesn't fall out. Or super glue it in there for a permanent fix. The bottle is hollow so you could put something inside. The bottle is not grooved for the o-rings. Also please check the dimensions below...the 16mm especially are quite long with a long wearable area.
Wearable Length / Approximate Overall Length (can vary by how far cork is pushed in):