I'll try to dig up the invoice.
Okay, I found the GM Parts Direct invoice and the part numbers.
10063145 - Hose assembly that runs from the engine to the one-way valve; List: $11.84, Net: $5.92
10192799 - Hose assembly that runs from the one-way valve to the tank (reservoir) under the front fender; List: $12.02, Net: $6.00
The one-way valve is included with one of the hose assemblies, but I can't remember which one.
14056624 - Tank (Vacuum Reservoir); List: $18.18, Net: $9.09
10456648 - Valve (One-way valve); List: $5.46, Net: $2.73
Handling: $9.78
Shipping: $6.59
Keep in mind that these part numbers are for a 1992 Lumina, 3.1L and the prices are 09/2002 prices. YMMV.