Here ya go:
R1 and R2
http://www.radioshack.com/product/in...entPage=family
10K-Ohm Horizontal-Style Trimmer
$1.29
Model: 271-282
Catalog #: 271-282
for R3 you can try this bundle (unfortunetly they don't mention specifications of what is inluded but I am sure 20 or 30K will be part of the bundle. They are very common)
http://www.radioshack.com/product/in...53&tab=summary
or use R1 10K pot in line with 10K resitor from this bundle
http://www.radioshack.com/product/in...entPage=search
100-Piece ½-Watt Carbon-Film Resistor Assortment
$6.29
Model: 271-306
Catalog #: 271-306
Another option all together is to use regular resistors from this bundle. the only disadvantage when you have to calibrate timer you will end up replacing resistors until you get desired results insead of simply adjusting it.
C1
http://www.radioshack.com/product/in...entPage=search
1000µF 50V 20% Axial-Lead Electrolytic Capacitor
$2.59
Model: 272-1047
Catalog #: 272-1047
D1
http://www.radioshack.com/product/in...entPage=family
$2.59
Model: 1N914/1N4148
Catalog #: 276-1620
If you don't have soldering tools you can try this one but choices are many
http://www.radioshack.com/product/in...entPage=family
5-Piece Basic Soldering Set
$7.99
Model: 64-2802
Catalog #: 64-2802
You can buy decent and chip multimeter from
http://www.homedepot.com/prel80/HDUS...gjj.0&MID=9876
Gardner Bender
19-Range Digital Multimeter
Model GDT-190A
Price: $19.99/ea