the cb-2000 was the original model; but since then they have improved versions: cb-3000 and cb-6000 and one called 'the curve'. All are made by the same company; so you may want to study which of those various ones would be the most effective and convenient for your particular body.
It is my impression that the actual 'cb-2000' is obsolete as the cb-3000 and cb-6000 and 'the curve' are improvements.
Whichever local store sells the 'cb-2000' must also sell the other ones as well.
You can also study them all at www.cb-2000.com
I hope that you are controlled with chastity being imposed & enforced.