Delaware publishes scratchoff data at https://www.delottery.com/Instant-Games
You can see the number of remaining grand prizes at https://www.delottery.com/Instant-Games/Top-Prizes-Remaining
Be sure to only play games where there's a large number of grand prizes remaining in relation to how many overall tickets remain.
Delaware doesn't publish the number of remaining prizes for the lower tier payouts, so we aren't able to get an accurate calculation of the expected value. Check back in the future. States are constantly updating their websites and as soon as it becomes possible for us to evaluate tickets, we'll start showing which scratch offs are best to buy in Delaware.
There are other ways to improve your odds.
Read any of the following articles for simple ways to increase your winnings.