Wellesley Books, Brewster Book Store, Odyssey Bookshop in South Hadley, and Porter Square Books in Cambridge are among the retailers getting a boost from best-selling thriller writer James Patterson. The author has pledged to give $1 million to indie bookstores to help them continue their work. He announced an initial grant list this week of $267,000. Wellesley Books owner Gillian Kohli wouldn’t tell us exactly how much her store will receive from the pot, but said that she and her staff did apply for the money and will be given exactly what they asked for. In its application to Patterson, Wellesley asked for cash to buy a new iPad to sell books during off-site events, a video camera, and a small PA system. “He’s incredibly generous and putting his money where his mouth is,” she said of the famous author.