Here's how you set this up:
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In your dashboard, manage your upcoming giveaway and click on Item & Settings. Make sure Settings is selected at the top and scroll down until you see Giveaway Style. Select Fixed Ticket price.

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Choose your fixed ticket price and then "And another level" to create more options. For instance, you could make your fixed ticket price 1 ticket for $5, Your next level may be 3 tickets for $12, 5 for $20, etc. That's it; it's super easy to add ticket levels and give donors an incentive to buy more tickets!