The hand-me-down Bold has a slightly recessed 3.5mm headphone jack. My old 3.5mm-to-3.5mm cable had fat plugs and won't work consistently.
One day I remembered that there had been a similar situation with the original iPhone. There's an Apple store nearby so I dropped in looking for a cable.
I found one.
$19.95! I left it in stock.
I did notice that it was made by Belkin. So when I got home, I went and looked at Belkin's site. This looked like the exact same item without the Apple brand.
$14.95. Headed in the right direction.
I finally bought it at Amazon.
Now that's an Apple tax.