First choice, beg, borrow, steal or even buy if you have to, but get a genuine Wiring board from Mr Barragan. This is going to be the fastest, cheapest and most reliable way to get a board running.
Contact him at the Wiring BBS
Second choice is to buy an assembled and tested ATMEGA-128 processor board, a programmer and an RS232 converter or a USB converter.
Get an AVR-H128 board for US$35.95 AVR-H128
Get an AVR-PG1 serial-port programmer for US$11.95 AVR-PG1
or get an AVR-PG2 parallel-port programmer for US$11.95 AVR-PG2
Get a part #0127 RS232 serial-port interface for US$9.95 Part #0127
or get a Part #0391 USB interface for US$23.00 Part #0391
You've now spent either US$57.85 for the RS232 type or US$70.90 for the USB type, so you've spent more than the Wiring board itself.
Third choice is to buy a bare ATMEGA-128 processor board, a processor, crystals, regulator, pins, a programmer and an RS232 converter or a USB converter.
Get a PCB-ATMEGA board for US$3.95 PCB-ATMEGA
Get an ATMEGA128-16AI-ND processor for US$15.05 ATMEGA128-16AI-ND
Get an CTX414-ND 16 MHz crystal for US$1.31 CTX414-ND
Get an SE33010-ND 32 KHz crystal for US$1.23 SE33010-ND
Get an LM2931Z-5.0NS-ND 5 Volt regulator for US$1.04 LM2931Z-5.0NS-ND
Get two 929834-02-36-ND header strips for US$3.60 929834-02-36-ND
Get an AVR-PG1 serial-port programmer for US$11.95 AVR-PG1
or get an AVR-PG2 parallel-port programmer for US$11.95 AVR-PG2
Get a part #0127 RS232 serial-port interface for US$9.95 Part #0127
or get a Part #0391 USB interface for US$23.00 Part #0391
You've now spent either US$48.08 for the RS232 type or US$61.16 the USB type, so you've spent more than the Wiring board itself.