Best way to get around countries needing onward flights

Some countries ask for onward travel or even return flights to prove you plan to leave the country and not overstay any visa.

There are Sites such as below that will build you an itinerary for customs at a cost , however there is a free way to do it!

Expedia free 24 hour cancellation on flight bookings. Just book your flights before you travel and cancel directly when you land!