I don't think the 20-3G or the 30-3G are sold anymore. I purchased mine before the Zulu series was introduced. You may be able to find a set on ebay. They are much bulkier than the Zulu but for my wore out ear they worked great. I still have my 20-3G and it is my spare for a passenger. I have thought of sending it in for the "upgrade" program but since they work fine I haven't done it yet.
WW