If that's what you REALLY want....then advertise for a second hand SBIG ST4 guider - the original and the best.....
I've gone through three of them so far - keep them for years and then sell them - regret the sale - and buy another!!
They just seem to keep going, and going, and....
Having said that.....usually nowadays you have to have a computer involved to drive and download the imaging camera (why else would you want to auto guide?) that being the case you already have the PC just add another cable and you're guiding......
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