Had a brand new Ray 34 Sunburst that I only had for a few months, but had to sell it because the wife needed a minor medical procedure that was not covered by insurance. Come to think of it, I never did get all that attached to that bass, too twangy for me, but still it was a bummer to have to let it go so soon.
The one I truly rue letting go was an '02 Mexican Precision I'd picked up used from GC. I already had my main axe, a '94 P-bass that is my baby, but picked up this Midnight Wine beauty so I could have one P with rounds and one with flats. This was at the tail end of the economic crash, and I had to let go of a LOT of nice things, and that '02 P was one of them. That one was so well-built and solid that a friend of mine commented that it was as good as some Americans he had owned/played. But the older P was my first, and the moment I held I felt as if it were made specifically for my hands, and I'll never let that one go. So I had to give up a primo sample of a mid-level bass. And boy do I miss it!