This category splits in two the moment you weigh it.
Games
Light, flat, cheap to send. Courier is right, a weight rule with a small first slab is right, and combining wins is where the money is: ten games from one show cost almost the same to send as two.
Combining is on by default and you set what each later win adds. Say it in the show.
Consoles
Heavy, bulky and full of things that must not move. A console in its original box needs an outer carton, which is bigger again — and size is what most couriers price alongside weight.
Weigh and measure the packed carton before quoting. An underquoted parcel comes off your own balance. How delivery is charged.
The four options
Courier for games and most consoles. Your own delivery locally, which buyers appreciate for consoles. Pickup, the honest answer for a boxed console or a large lot. Buyer arranges, for a collection.
When collection is the honest answer
For boxed consoles, CRT-era hardware and bulk lots. Agreed before bidding, with a collect-by window of 72 hours unless you set otherwise. How pickup works.
One thing to settle before the show
If a console has a battery inside, check what your courier does with it before you promise a delivery price. Packing electronics covers the restrictions.
Questions people ask
Do sealed games need a different service?
Same service, better packing, and nothing pressing on the seal.
Should the original console box go in a carton?
Always, if it is part of the value.
Free delivery over a value?
Works for games, rarely for consoles.
More: setting up delivery, packing games.