Charging to room key? How much does Disney "hold"

[addiedisney]

Can anyone tell me how much Disney Resort hold on your card for shopping purposes? If I want $300 charged up front, can I ask them for that?

Thanks!

I posted this under resorts as well.

 

[TDC Nala]

As this is not a restaurant question, and has already been posted on the resorts board, I am going to close this thread rather than move it to the resorts board.