Silvester said there were 50,000 searches in October last year, and they expected the search numbers to rise to that level by the end of the month.
"Costumes are always really popular on Trade Me and we see a huge spike in interest at Halloween. Only the Sevens and Auckland Nines create a similar jump but they're no match for All Hallows Eve."
Along with killer clowns wandering the streets on October 31, people can expect to see a few other recognisable characters.
"Kiwis like to be on trend with their Halloween outfits - in previous years superheroes like Iron Man, Batman and Spiderman have been very popular when the films have been out and about while 'sexy' has trended in past too, this year Kiwis seem to be keener on the 'scare' element of Halloween."
Those inspired by the 2016 movie Suicide Squad will be out and about in Harley Quinn outfits with just over 2600 searches for the supervillain.
A few Disney characters might also be knocking on your door next week with over 2000 searches for Moana and Alice in Wonderland costumes.