If you really want to go on the cheap (<$20) try my PIC based logic analyzer. 
I use it for I2C and SPI.

http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnalyzer
http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnalyzer 


   Ted.


Marc Nicholas-2 wrote:
> 
> Howdy folks,
> 
> Logic analyzers: I think I need one ;-) Although I do have a
> 4-channel/100Mhz scope already...
> 
> Specs would be:
> 
> - 8+ channels (I can live wit 8)
> - Must be able to "decode" SPI and I2C
> - USB connectivity
> - < US$1000 "all-in"
> 
> Anyone got any favourites? Or units that they *hate*?
> 
> TIA,
> 
> 
> -marc
> -- 
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> 
> 

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