online sources for interfacings - USA

I can only post about brands and sources that are in the USA - it's what I know. If you've got a list of sources/recommendations for international sources please go ahead and write a post to share, if you will.
Brands /Trade names

• Hymo - hair canvas that is typically listed as 60% wool 40% goat hair in the natural colors (black has a different fiber content!) 66" wide, 3 weights, sew in or fusible. made in France
  
• Acro - hair canvas 54% polyester. 27% hair. 12% cotton. 7% wool. 23" wide sew in or fusible
  
• Silver edge Acro - hair canvas, sew in or fusible 33%viscose/20%wool/17%polyester/17%cotton/13%hair. Width, 20 in.
  
• Tailors Pride Hair canvas - this one is all over the map on content 40% cotton/33% hair/27% rayon. med to heavy weight 23" wide at Sawyer Brook
  
• More Tailors Pride hair canvas - 41% Acrylic/19% Hair/16% Polyester/15% Viscose/ 9% Cotton 23" Wide. dry clean. at Vogue Fabrics
  
• see table at bottom for chart from HTCW - manuf of all of these products except the Hymo
  
• Armo weft - see table
• Whisper weft - see table
• see source list for other weft insertion interfacings - Palmer Pletsch puts one out that is widely available in the chain stores.
  

Links for sources in no particular order:

Haberman's - black hair canvas $24/yd, Hymo in med and light weight $23.75/yd, and satin back coat lining in 10 colors

The Sewing Place - Hymo, weft insertion fusibles

B.Black & Sons - Hair Canvas

From Baer Fabrics - sew in flannel for interlining, 54" wide
They also have Acro - sew in only

Sawyer Brook - sew in and fusible acro and Tailors Pride for hair canvas and a variety of fusible knit and weft insertion products

Waechters Silk Shop - Armo-Weft in black and white (this link is for the black, but they have the white too.
Waechters Silk Shop - Fusible Acro

Vogue Fabrics
for light and med weight Hymo, fusible and sew in Acro, and Tailors Pride

Greenberg & Hammer Inc. Various weights Hymo, Acro, Armoweft
be sure to read the descriptions and contents for the various different interfacings you're considering.

Apple Annie Fabrics - Angel Weft

SewExciting -fusible weft - has excellent service and brands their own - highly recommended by Liana, (check out Liana's complete eval of their interfacings on her blog) -

FineFabrics.com -hair canvas, sewn in
Susanne at Fine Fabrics emailed me to say that she has a high quality hair canvas in her shop. It's not on her website, so contact her for information.

ACRO Sew-in, machine washable hair canvas for tailoring. 54% Polyester/ 27% Hair/ 12% Cotton/ 7% Wool SEW-IN	87007	23”	NAT	25 YDS ROB	$12.31
FUSIBLE ACRO Fusible, machine washable hair canvas for tailoring where firm control is desired 54% Polyester/27% Hair/ 12% Cotton/ 7% Wool FUSIBLE	87008	23”	NAT	25 YDS ROB	$13.44
TAILOR’S PRIDE Sew-in, hair canvas for crisp shaping. 41% Acrylic/ 19%Hair/ 16% Polyester/ 15%Rayon/ 9% Cotton SEW-IN	87009	23”	NAT	25 YDS ROB	$10.06
ARMO WEFT Fusible, medium weight, weft insertion interfacing for soft tailoring. 60% Polyester/ 40% Rayon FUSIBLE	88001	20”	BLK	25 YDS ROB	$3.92
ARMO WEFT Fusible, medium weight, weft insertion interfacing for soft tailoring. 60% Polyester/ 40% Rayon FUSIBLE	88002	20”	WHT	25 YDS ROB	$3.92
WHISPER WEFT Fusible, lightweight, weft-insertion interfacing for soft tailoring. 60% Polyester/ 40% Rayon FUSIBLE	88022	20”	WHT	25 YDS ROB	$3.69
WHISPER WEFT Fusible, lightweight, weft-insertion interfacing for soft tailoring. 60% Polyester/ 40% Rayon FUSIBLE	88025	20”	BLK	25 YDS ROB	$3.69