Using paypal for buying cryptos has always been difficult. I'd suggest you buy bitcoins somehow, since they are much easier to get, and then buy DGB with your bitcoin.
I'm pretty sure there are a lot of bitcoin exchanges that will accept many different kinds of payment (Probably not paypal, though...)

Try taking a look at the Currency Exchange subforum here on bitcointalk. You may even find a thread with someone who is willing to sell bitcoin for paypal! Make sure you read the thread and check the persons reputation before you purchase anything.

Hope to see you here smiling when the Digirush happens  
( On the forums that is... Please don't barge into my house  )