Best Buy on Monday announced a new MacBook buying plan that lets users finance a laptop for 36 months and at the end of the term, customers have the choice of upgrading to a new laptop, paying off the current laptop, or returning it and ending the program. Best Buy’s plan, called Upgrade+, is similar to Apple’s iPhone Upgrade Program. When a customer enters the Upgrade+ program, the price of the MacBook is spread over 36 months, with the final payment due at the end of the plan. For example, an M1 MacBook Air at $999.99 would have payments of $19.99 per month for 36 months. At 37 months, a fin…