On the other hand many brands you are familiar with are available and things like shampoo and toothpaste are easy to pick up here so you don't need to lug a months supply overseas with you. The same with film, batteries, etc. Instead of bringing all your sweaters and leather boots plan on buying them here. The prices on leather goods is very, very reasonable and sweaters of Irish wool are unbeatable. You are allowed two pieces of checked baggage and one carry on per person on international flights.
Breakfast is a bargain here.
If you order coffee with cream it will come with a big dollop of cream that has been whipped to a stiff consistency, so if you don't like cream be sure to specify milk. In pubs, if you order a pint that is what you get - a full pint. American beers are readily available but no trip to Ireland would be worth it without a pint of Guinness. Also all beer in Ireland, even Armerican beers, have a higher alcohol content so beware. Tipping is not required in Ireland, nor really expected.