Not possible to buy several Kobo-books at once?

I have bought books at Kobo before, but never purchased/tried to purchase more than one at the same time.

But after I read the KoboBooks.com Discount thread, I wanted to buy several books today, and noticed that I have to go through the billing process already after having chosen my first book. Only after I have paid the book, I get a button 'continue shopping'.
Is this always like that? Quite annoying to have to sign in to paypal for every single book...

Ann