Exhibit A: WBT Locking banana connectors from Parts Express ($36 PER plug)
Exhibit B: Locking banana from Speakerrepair (#40 for 10)
BTW the pic from GLS is the old 'Generation 1' so what you are actually getting is the revised Gen2 stuff.
I normally don't associate Parts Express with such foolishness but on the flip side of the coin can't blame them for taking a chumps money.