Scott,
The best supplier does not necessarily offer the best prices. A better supplier will provide some guidance as well. Somone with experience can hep you avoid costly mistakes in buying the wrong parts. Parts delivery can also be an issue. If it will take the supplier a month to get the part to you that could be a real problem.
Welcome,
Ted
1969 280SL
PS: Ray of SL Classics is now working for Bud's Benz