Here are the radioshack.com parts numbers and prices for the transistors and some other parts. These were the prices in the fall of 2000.
Part # Radio Shack Part # Unit Price MPS8099 900 -5371 0.23 MPS8599 900 -5372 0.22 2N3439 900 -5437 1.93 2N5415 900 -5360 0.99 MJE15030 900 -5282 1.44 MJE15031 900 -5283 1.54 MJ15003 900 -5266 3.25 MJ15004 900 -5267 3.45 DIO 1N4004 900 -2872 0.10 DIO 1N4148 900 -2908 0.15 20K Ohm 900 -0249 0.07 2K Ohm 900 -0225 0.07 300 Ohm 900 -0205 0.07 2K2 Ohm 900 -0226 0.07 2K2 Ohm 1/2W 900 -0387 0.09 12K Ohm 900 -0244 0.07 11K Ohm 900 -0243 0.07 1.1 Ohm 900 -0155 0.07 POT 2K GSL-TRN 900 -4673 1.19 22K Ohm 900 -0250 0.07 30 Ohm 900 -0181 0.07 360 Ohm 900 -0207 0.07 1K Ohm 900 -0218 0.07 270 Ohm 900 -0204 0.07 3K9 Ohm 1/2W 900 -0393 0.09 82 Ohm 900 -0192 0.07 330 Ohm 900 -0206 0.07 220 Ohm 900 -0202 0.07 470 Ohm 900 -0210 0.07 10 Ohm 900 -0331 0.09 0.33 Ohm 5W 900 -0886 0.34 ZNR 1N5250B 900 -3105 0.09