Buy Plane Geometry or Linkage Design using PayPal.

Please pick the button for the product you want. This will send you off to PayPal where you can enter the correct price and complete the transaction.

• Plane Geometry: Please enter the following amounts depending on where you live and what you want:
  • Everyone but California residents, electronic version: $19.95
  • Everyone but California residents, CD ROM version: $24.95
  • California residents, electronic version: $21.60
  • California residents, CD ROM version: $26.60
• Linkage Design: Please enter the following amounts depending on where you live and what you want:
  • Everyone but California residents, electronic version: $9.95
  • Everyone but California residents, CD ROM version: $14.95
  • California residents, electronic version: $10.77
  • California residents, CD ROM version: $15.77
• Plane Geometry and Linkage Design: Please enter the following amounts depending on where you live and what you want:
  • Everyone but California residents, electronic version: $29.90
  • Everyone but California residents, CD ROM version: $34.90
  • California residents, electronic version: $32.37
  • California residents, CD ROM version: $37.37