COST     Item      Quantity  Sources and prices
(4 boards)        per board
$110.00 PC Board        1  www.pcbnet.com $110 for 5
  $0.70 22pF           2   www.jameco.com p/n 15405CF 10 for $0.70
  $3.00 0.1µF          8   BGMicro.com CAP1051 12 for $1.00
  $1.00 10µF            1  BGMicro CAP1042 10 for $1.00
        100µF          1   ... use the 10µF instead
  $0.24 1N4001          1  BGMicro $0.06
  $2.36 DIN5            1  Jameco p/n 29399CF $0.59
  $1.40 DB9F            1  BGMicro CAB1030 $0.35
  $2.64 34HDR          2   BGMicro $0.33 each
  $0.66 SIP 2-pin      4   BGMicro $0.33 for 36 pins; cut to fit
        SIP 3-pin      1   ... make from above
        SIP 4-pin      1   ... make from above
  $0.99 220 ohm 1/4W    2  Jameco p/n 30470CF 100 for $0.99
  $0.99 1K 1/4W         1  Jameco p/n 29663CF 100 for $0.99
  $1.00 10-pin SIP 10K  5  BGMicro RES1002 2.7K SIPs @ 20 for $1.00
  $4.40 8-pin SIP 10K  5   Jameco p/n 97826CF 10 for $2.20
  $0.99 10K 1/4W       5   Jameco p/n 29911CF 100 for $0.99
  $0.99 10M 1/4W       1   Jameco p/n 29938CF 100 for $0.99
  $1.60 4-Pos DIP Sw    1  BGMicro $0.40
  $2.00 8-Pos DIP Sw    1  BGMicro $0.50
  $1.00 Pushbutton      1  BGMicro 10 for $1.00
 $27.80 68HC11A1FN      1  BGMicro $6.95
  $0.88 74LS04          1  BGMicro $0.22
  $1.44 74LS139        1   BGMicro $0.40, Jameco p/n 46623CF $0.36
 $12.48 74HC165        8   BGMicro $0.58 each, Jameco p/n 45495CF $0.39
  $1.60 7805            1  BGMicro $0.40
        DS1233-10       1
  $5.00 MAX232ACP      1   BGMicro ICS1020 $1.25
  $2.00 8MHz XTAL      1   BGMicro $0.50
  $1.00 14-IC socket    1  BGMicro 10 for $1.00
  $4.00 16-IC socket   10  BGMicro 13 for $1.00
  $3.96 PLCC 52-pin so  1  BGMicro $1.29, Jameco p/n 72442CF $0.99
  $1.25 Wall-wart      1   BGMicro PWR1021 7.5VDC @ 1.3a $1.25
 

$197.37 TOTAL for 4 boards
 $49.35 price per board