Use formulas: 2a4, 2a3, 2a6, 4a3, 4a6, 3a6. Replace letter 2 with every number from 0 to 9. You'll get 60 tickets. Flip them, get another 60 tickets. You can pick from this group, or play them all, 120 tickets to try and win $500.
Numbers 2436, by my calculations, might be at play. You can also make pairs out of them, to try to win $50.