If you are only building one and don't already have some thin sheet metal that you could use it will cost around $90 + shipping not including the tin. The tin comes in 5 pound ingots and costs around $4 per pound ($3.65 per pound if you but 100 pounds).
1 soft fire brick 9" x 4.5" x 2.5"
$6 (a box of 25 is around $60)
1 square foot of 1" thick Kaowool Ceramic Fiber Blanket
$5?
100 feet of 21ga. Thyssen Resistance Wire (0.845 ohms per foot). This is enough for 3 elements.
It's about $30 for a pound (~800 feet) but I'm but sure what the price is for a 1/8 pound which would be 100 feet.
2 Porcelain Insulators, T-type
$2
2 Standard Screw Connectors
$2
3 feet of 14ga. High temperature kiln switch box wire
$3?
McMaster-Carr (A lot this stuff maybe cheaper at your local hardware store.):
24" x 24" of 0.024" Type 304 Stainless Steel (2b finish)
$21.34
1 male electrical plug
$4.48
100 Pack of #6 x 3/8" 18-8 stainless steel sheet metal screws (if you don't already have some)
$5.68
3' long 3/16" diameter galvanized steel rod
$1.85
Clip-On Bimetal Thermometer with 1 3/4" dial, 5" stem, and a temperature range of 200F-1000F
$19.92
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Craig Nadler
cwn@nh.ultranet.com http://www.nh.ultranet.com/~cwn/armour.shtml