A lot of that will depend on where you live. Riba is the most prominant and most common method available for most people Muslim and non-Muslim for most items.
Here in Texas it will depend a lot on what you buy. Up until recently (about 20 years ago) It was illegal to get a loan to buy Real Eastate. Under Texas law it is/was illegal to take a persons home to satisfy a debt. as a result nearly all real estate transactions were owner financing. It is illegal for a non-licensed entity to charge interest, unless they are a licensed banking institute in Texas.
The laws have changed somewhat in the past few years but many people still buy there homes at no interest through owner financing. Many others buy through rent to buy options, which means you agree to rent the home for say 20 years at an agree price and than at the end of the lease you agree to buy the house for a small amount normaly $100 to pay for the title transfer.
But for all other it is riba loans.