Unfortunately the best (most reliable and least expensive) consolidators deal only with travel agents. Several reasons for that. So it is best to find a good travel agent who works with consolidators. If they are heavily into international travel, they should be able to find you good deals through consolidators.

You need to be sure to ask the travel agent if the specific fare they quote you earns miles. Some fares from consolidators do, some don't. Consolidators often have fares with the same airline for the same dates, some of which allow mileage accrual and some of which don't.