I've tried to put this box together on a pretty tight budget. I've included some comments on part sources/prices.
 
My hardware 
Main Board  SI54P AIO I bartered 2 bottles of wine for it.
CPU  75 MHz  Intel Pentium Came with the board.
Memory  32 Mb 16 Mb came with the board.  16 Mb donated by my son (good kid).
Hard disk  1 Gb, Western digital + 120 Mb Maxtor  WD bought a while ago ~ $200, Maxtor $2 at Garage sale
Modem  Zoom 33600 external ~ $85
Monitor  none  Use old SGI as Xterminal.  Plug in monitor from wife's PC for occasional console work. 
Graphics Card  Orchid ProDesigner Loaner.
Network card 3com 3c503 Freebee.
CD-ROM  Gateway/Wearnes 6X Left over from upgrade of wife's Windoze box.
Backup  none yet Working on it.
Printer  Epson LQ-510 Bought used $20.
Printer 2  Panasonic KX-P4420 laser printer It's old and needs service - got it for free.

This system is both MY principal machine and, thru IP masquerading, the PPP connection provider for our home network.  Since I haven't got a monitor for it I login to it from an old SGI personal Iris I have.

Yes I scrounge old hardware.

BTW just for the Operating System Sucks-Rules-O-Meter, Linux rules!

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