Upload & Sell: Off
What you can be sure about bigvalueinc is that you'll definitely get the item. However, a warning must be mentioned regarding warranty. They are known to sell gray market items, but they advertise in the more recent listing that their products have USA warranty. This is in fact a fault advertisement as they are not an authorized dealer. If Canon provides any service, it's a courtesy one, but don't bank on it regarding warranty.
Use toolhaus.org to check their most recent negative and neutral feedbacks.
If it's me, I'll take it as new with no warranty.