I have two straps for sale that I'm not using anymore. I'm slinging my basses a lot lower these days in my cover band and these straps see no action. I can use the money for other things.
Paypal accepted.
One of the straps is an adjustable padded leather/nylon strap. I had it modified at a shoe repair store to be shorter. I went through a phase where I wore my bass really high and I couldn't get this strap short enough to my liking, so I had it modified. You can see the stitching in the photos. The leather section of the strap is 3" wide.
$20 shipped in the US.
The other strap is a Levy's strap. I measured it's width and I came up with 3 3/8". Maybe my measurement is a little too picky, but that's what I came up with.
$30 shipped in the US.
SOLD 
Top side of each strap.

Bottom side of each strap.

Top side front end of each strap.

Top side tail end of each strap.

Bottom side front end of each strap.

Bottom side tail end of each strap.

Top side of modified stitching job.

Bottom side of modified stitching job.