Most laptops chargers sold today will use either 100 or 220V without issue, you may need to order a different power cord from the brick to the wall socket though. This si also true of desktop
PCs (though why you'd want to bring a desktop
PC while cruising is beyond me!). Likewise for many small household appliances
the problem isn't going to be finding devices that will run on 220, that's easy, it will be finding places in North America where you have 220V shore power
. A step-up transformer could be used to switch North American standard 110V shorepower to 220V, though I'm not certain of the cost there.