The first thing you must do when you have signed a contract to buy a property, especially where there are professionals involved in representing the interests of either party, is to lodge a caveat to protect your interest in the property until settlement. A caveat will stop the vendor from selling to someone else or encumbering the property without notice to you.
If you need to find a buyer fast, our company is in the land buying business. If you've got time to wait for a few months, then get it posted on your standard online sites (don't underestimate Craigslist!) and consider hiring an agent. If that doesn't work out or you don't feel like waiting, we've got a network of buyers at Landmark Property Buyers.