The "<$400" is still just as relevant today as it was when it was posted over 7 years ago, with minor changes, and general reduction in pricing. Take a look here:
http://goccf.com/t/158182The basic system summary is:
Canon XS camera, body only: $175 (now ~$100)
EOS-M42 Adapter: $5
M42 focusing helicoid, 17-31mm: $30 (now recommending 25-59mm, same price)
M42 extensions, 2 sets 7/14/28mm: $15
M42-M39 adapter: $3
M42-RMS Adapter: $15
Nikon 75mm EL-Nikkor Lens: $40 (now typically $50)
Nikon M5 or Plan4 objective: $30 (now typically $50)
Tripod: $30
IKEA Jansjo LED lights, two: $20 (no longer available)
Total $363 (now $298 plus lights, or $253 without the details objective and adapter).
Contact me for photographic equipment or visit my home page at:
http://macrocoins.com