There are several places to get them... I have used "
Undercover Tourist".
the price you see is the price you are charged.
Taxes are included and shipping is free. Very important to note. Sometimes one company looks cheaper... then when you get to the last page, you see all the taxes and chages for shipping. Someplaces you can pick them up free of charge so that would save you some money.
You can also subscribe( free) to some of the "Mouse" newsletters like
"All Ears" and
"Mouse Savers" They can have special codes for you to use to get further discounts.
That should get you started.
You can skim the surface of the parks( espically MK) and do 1 park a day
but most would say you will need at least 5 days. Then there are all the options, to add "Park Hopping" or "no expire" or even "Water Parks and More"
Lots to think about... best thing to do is get lots of ticket pricing from various vendors and lay it out on a spread sheet. That way you can compare
and find the best fit for you.
Being one "child" is now 10 they have to buy the adult ticket so that runs the cost up a few dollars.