That's interesting, those prices from Sears in 1962 are lower than buying from O&R in either 1961 or 1963 , thanks for sharing.
Here are the equivalent O&R engine models & prices;
32FA8800, 3300 RPM no clutch = Model D, 1961 $47.95, 1963 $47.85
32FA8801, 3300 RPM with clutch = Model G, 1961 $48.95, 1963 $49.25
32FA8802, 1700 RPM no clutch = Model E, 1961 $47.95, 1963 $47.85
32FA8803, 1700 RPM with clutch = Model H, 1961 $48.95, 1963 $49.95
32FA8804, throttle control = A-50, 1961 & 1963 $1.00
The 1961 brochure/price list is in the manuals sticky thread if you haven't seen it (Section 1), I still need to add the 1963 one.
David