Quick couple of questions for you paper-zed veterans.

Plan on going to Cyprus this summer, Cyprus Airways uses only paper zeds and I have no idea where in Europe we will end up flying into Cyprus from.

If I was to buy multiple paper zeds from multiple departure locations, do you get charged for each right away and then have to get refunded for un-used zeds, or are you charged only upon use?

Also, can I buy them at Delta Ticket counters once in Europe?

Thanks,

Humboldt