This is not an immigration question either. You also asked about banking, buying a condo etc. Google is your friend so you can do some research or your son can.
What type of car will influence the price. You could be looking for a base model small sedan to a fully loaded truck. Could be 100k difference. The car market still hasn’t recovered from Covid so car prices are higher than average especially secondhand cars and there may not be great inventory. If budget is a major issue I would be a bit more flexible on the type of car you are looking for. Many others are looking for a secondhand toyota vehicle with low Kms, no accidents, etc.and given that supply of secondhand vehicles was already very tight and prices have been higher than average due to Covid and other issues like natural disasters you may have to pay a significant premium to purchase certain secondhand vehicles. Would suggest having a few potential options when it comes to potential vehicles and be very careful of any private sales (would personally not take the risk), take a car to your own mechanic for an inspection, get it’s background history, etc.