You could win a dream vacation in the Travel Raffle held by the Buffalo and Erie County Botanical Gardens. The Travel Raffle is offering three prizes: The grand prize is a dream vacation of the winner’s choosing. The second-place prize is a relaxing getaway to the Sterling Inn & Spa in Niagara Falls, Ontario.The third-place prize is a two-day vacation to Ellicottville. Travel Raffle tickets are $20 each and are available through Sept. 3. Each ticket has three chances to…