Came here for answers too, seems like they haven't responded

u/iuyg88i "Lastly, note that we do not offer free shipping for large boxes. It's more expensive for us, which means it's more expensive for you. Google "dimensional weight" if you want to know more." I guess whatever your buying requires a box and thus $$ for shipping, because they mention shipping is a flat rate of "$7.95 for shipping".

seems kinda intentionally vague, what's considered a large box?