approx. parts listing and pricing...

all prices are in australian dollars

TXID1620 pcb will be. $ 36.oo 
(including plans/overlays etc)

the rest of these components are from
Dick Smith Electronics (anywhere)

ISD1416 (16 second)   $ 20.oo
relays                $ 20.oo
monitor speaker       $ 10.oo
case (optional)       $ 15.oo
other ic's            $ 10.oo
pushbuttons, pin hdr,           
transistors,leds, 
resistors, pots,
capacitors, etc       $ 20.oo
=============================
Total ............... $131.oo
being on the Very OVER costed
caution side...
=============================
plus a $69.oo donation to
Bob BARNES for his good looks
charm, personality, modesty.
...
end of file, thankyou...