Y socket adaptors questions

I KNOW THEY MAKE THE Y SOCKET SPLITTER SO YOU CAN PUT 2 BULBS IN PLACE OF ONE BUT I THOUGHT I SAW A SORT OF SPLITTER THAT INSTEAD OF 2 SOCKETS IT WAS 3.
I NEED SOME INSIGHT ON THIS CAUSE IF THAT IS TRUE I WOULD LOVE TO GET ONE OR TWENTY!!!!!!
ANYWAYS PLEASE LEND ME A HAND ON THIS TOPIC I WOULD BE MUCH APPRECIATED

where did u get the 3 way splitter at.

bump please lend a hand
not for me for my sis
she lives in the states
doin a lil info look up for her