I don't sell, but the following was posted on the BMG guidelines (R' Forcheimer et al):
Selling Chometz Gomur
We suggest that even if you don’t ordinarily sell גמור חמץ ,this year you should evaluate your situation,
as it will be difficult to obtain Chometz right after Pesach without exposing yourself and others to sakana
from crowds attempting to purchase Chometz. If in the past you did not sell גמור חמץ and you choose
to do so this year you do not need to make נדרים התרת to do so.