I'm expecting my boyfriend's parents to help me pay for a trip
Do you think they should pay for your trip?
Yes, I only have a small amount of money to pay for a trip, they should help me out.
If you're going on the trip you need to pay your way for it. It's rude to just expect others to pay for you, especially in this case since they're not your family.
It is only a couple hundred bucks, they can spare that much.
It does not matter how much it is, that is something you should pay for on your own. People may not want to associate with you if you ask for money all of the time.