Don't sell the goat

I don't usually cover Aramaic דקדוק and I cannot claim to know terribly much about it but it seems the entire world sings חד גדיא pronounced thusly: חד גדיא, חד גדיא דְזַבִּין אבא בתרי זוזי It's a tricky word because almost the same word is used for buying as for selling. However, it seems from the הגדות מדויקות that the proper pronunciation is in fact דִזְבַן. I haven't done too much research on this but I know someone who has. The Haggada of Rabbi Jonathan Sacks by Koren Publishers also has דִזְבַן.