Hey there,
Have you actually tried it? Pay Pal has a location within the United States so as long as your card works online it should be ok. I had a domestic debit card a while back and it worked fine!
If not, unfortunately you make just have to pick up a new debit card at the store. :c
Luckily they're no more expensive really- just a bit inconvenient.
If you continue to have problems please send a help ticket!
help/gethelp