My best deal ever was the full-price purchase of a Follis 472 in 1974. It got me into serious road biking and showed me how much fun riding could be.
The best deals don't have to be cheap.
But it would help to realize what they are, and not take them for granted.
That Follis goes on record as being my most regretted sale.
~20 bikes later in Ramat-Gan, Israel