The biggest risk of online buying is purchasing "sight-unseen". If the car is far away, hire a service like Lemon Squad or AiM Certify . For roughly $100–$200, a certified mechanic will visit the car and provide a detailed report on:
The "best" site depends on your priorities for convenience versus price. how to buy a used car over the internet
Use an aggregator like AutoTempest to see what's available nationwide today. The biggest risk of online buying is purchasing