$2-5 for vacuum cup, $7 for necklace strap but could use string save about $6.80, glans protectors $4, elastic Walmart string as ring about 12-20 cents, so I will say safely this costs max $16.20 BUT could have been $11.80 if using only string for necklace part even could save about $2-3 and use Amazon finger sleeves instead of glans protectors (a bit harder to pull over cup but should work too) I will be trying it out tomorrow!!!!!!!+++++++