Using JustGiving.com, we are running a campaign for raffle tickets and we prefer to have the raffle ticket prices in the donation amount boxes: $5, $10, $15, $20 to avoid confusion and make it easier on our contributors. Price of raffle ticket is $5 each, or 5 for $20. Then the donor can still enter an amount in the box designated for "other" amount. This would streamline our process; again makes it easy on our constituents purchasing raffle tickets.