Free method to find Exact Match Domain Names:
1. Type the root keyword in Google adwords keyword tool, example "winter boots" add filter to show keywords that only have minimum local search of 1000 (based on your requirement). Select exact match, uncheck brad and phrase matches. Run the query.

2. The list will be displayed, select download as csv option to download all the keywords as a csv file.

3. The keywords in CSV file have [] in them, as we used...