I'm a FT Seminary student... one year left, and will then be a minister at a church.
DH is a branch manager in training. He does loans and stuff. Home equity.
We can only afford to go because my mom is a CM and we can stay with her, get in free, etc. So when we go, we go to see her first, and then get the perks of visiting the parks. =) Even with just having to come up with airfare and food, it gets expensive.
Once I am working FT, we fully intend on automatically placing a portion of each of our income into a travel fund just like any other bill.