Matt, a service like this provides the opportunity to purchase a vehicle at a pre-negotiated price point without the haggling. While it may not always be the "lowest" price available, the key is the "no haggling" part. Many folks really hate "the car dealer dance", so these buying services are attractive to them. And many folks also are "blessed" with local dealers that really don't do much negotiation, especially in smaller markets where they are the only game in town. I always like to try and give business to local concerns, but when their price is way more than other sources, rather than a small and reasonable premium for being local, I'm willing to try other methods.
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The most expensive tool is the one you buy "cheaply" and often...