From scoot.net

Some states require the original MSRP in order to register a scooter (New Hampshire comes to mind).

Contents 1 USA 1.1 Vespas 1.1.1 1964 1.1.2 1972 1.1.3 1976 1.2 Allstate Vespas 1.3 Lambrettas 1.3.1 Lambretta Dealer Tags 2 UK 2.1 Douglas (Vespa) 2.1.1 1980

USA

Vespas

1964

 Vespa 50 $269
 Vespa 90 $319
 Vespa 125 $389
 Vespa 150 $439
 Vespa GL $469
 Vespa GS $519

1972

   The original paperwork was in my 72 sprint.
   $472 including the finance charges.
   I could not make out the %, or how long it was financed.

1976

   Vespa dealer pricelist, effective October 18, 1976.
   Suggested list / Dealer cost
   90 Sport 765.00 / 575.00
   125 Primavera 865.00 / 650.00
   150 Super 955.00 / 717.00
   150 Sprint 1010.00 / 758.00
   Rally 200 1165.00 / 875.00
   Above prices do not include freight and setup charges.
   Prices subject to change.

Allstate Vespas

1960 Vespa Allstate $319.95. You could buy it on time for $27 a month.
1964 Vespa Allstate (A Red "Cruisaire") $349.00

If you are looking in an old Sears catalog note you really need to look for the "Automotive Supply Catalog" supplement, at least for '60. Do not belive the Cruisaires were in the main catalog.

Lambrettas

Lambretta Dealer Tags

Undated group found (suspect 1964 or 1965 due to models presented)
TV/175 (w/speedo and dual seat) $494.50 + Spare Wheel and Chrome Luggage Rack $30.00
150/LI (w/speedo and rear seat) $444.50 + Spare Wheel $20.00
125/LI (w/speedo and rear seat) $359.50
Cento (w/speedo) $299.95
200/TV (w/speedo and dual seat) $509.95 + Spare Wheel and Chrome Luggage Rack $30.00

UK

Douglas (Vespa)

1980

Douglas trade price list effective 18th February 1980. These were the prices Douglas sales and service charged their main dealers. Unknown what dealer's markup was.

  50 Special: £317.83
  100: £338.70
  P125X: £462.61
  P150X: £500.87
  P200E: £538.26
  Add £13 delivery and 15% V.A.T.

Discounts of about 20% for cash on delivery, or 18% for settlement within 28 days. (Thanks Niall)