Gum Proxabrush Go-Betweens Angle Cleaners
8 Pack $2.99. (Free shipping over $25)
8Pack $2.26 (No Free Shipping)
12+ Quantities $2.21
8pack $2.79 (Free shipping over $49 / Not available in stores.)
Oral B Compact Tapered Interdental Brushes
$1.99 per brush (Free shipping on $75 or more)
Amazon & many other sites offer cylindrical brushes.
Oral B and Patterson do not sell to consumers.