According to the search results, the hard-to-get Monopoly stickers for McDonalds Monopoly Canada 2023 are:

• Tunnels of Moose Jaw (Orange – #511)
• Mackenzie River (Light Blue – #504)
• Portage and Memorial (Green – #420)
• Fairmount Le Chateau Frontenac (Dark Blue – #421)
• Rideau Canal (Brown – #503)
• Vancouver Airport (Airport – #526)

These stickers have the lowest odds of being collected, making them the rarest ones in the game. If you manage to collect all the stickers in a set, you can win a prize, which can range from food items to cash, gift cards, or even a car. It is important to note that the odds of winning the top prizes are very low, and collecting all the stickers in a set does not guarantee a win.