Karen,
I looked in:
Golfsmith
Strikeline M2
Bee-Line 1
Bee-Line 2
Tom Wishon Golf
Smooth Series 6 or 7 with added w/ added tungsten wgts
Hireko Golf
Bionik HP 425
Bionik 209 w/ wgts
Acer CB4
Acer CB2
For what it's worth, I've found that by corking sand down the shaft,
I can fine tune putter weight for players who like a heavier feel.
But it's important to have the shaft at the right length for that
player, because head weight feel varies a great deal with length,
just as it does with swingweight.
Brad