For those of you interested in upgrading your processor -
Hard Drives Northwest (Lynnwood) has (1) K6-3 (400) w/256k L2 cache remaining in stock, at $79. I've called shops from one end of the Puget Sound to the other, and this is the best price I've found.
You'll need the $40 Universal Voltage Regulator to support the 2.4v core/ 3.3v I/O requirement for the chip. Also, a cooling solution akin to the Tennmax Iop will be a must.
The Bellvue location no longer stocks this chip.
Contact Info -
Hard Drives Northwest
19723 HWY 99