Yeah a good gaming laptop will cost you a looooot more than a desktop. But if you got the dough check out places like Tiger Direct or the more renown (and expensive) Alienware. Dell makes gaming laptops as well but I have no experience with those.
Dell bought Alienware a decade ago

They're just two product lines of the same company now.
Last year, I bought a (then) all-but-top-tier desktop gaming PC from iBuyPower... which is a good option for anybody who wants to be able to specify every detail of every component but doesn't want to build it themselves, and who wants a warranty on the whole system. Since companies like that order lots of parts, it can even be cheaper to buy from them than to put it together yourself. Was about $1000 and I had a great experience with them. (Hint: if you choose one step down from the top of the line, you get a much better price for almost as much capability. And the only bits you really need to spend on are CPU, graphics card and memory; for everything else, average or below is fine.) I think they have laptops too, can't speak to those though.
Having said that, ESO is an MMO... any modern single-player game is going to require a lot more performance than it will. So you don't need top specs for it. A top of the line machine is only worth it if you play other games.
And forget Mac

Many games come out much later for it than for PC, and some never do.