Reddit reviews RuiLing 1PC Aluminum Alloy GT2 Timing Pulley Bore 8mm Teeth 60 for 6mm Width 3D Printer GT2 Timing Belt
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Material: Aluminum alloyBore: 8mm/0.315in; Teeth: 60TThis synchronous aluminum belt pulley is for 3D printer.Suitable timing belt width: 6mmPackage includes: 1 X GT2 8mm Bore 60T Timing Pulley
For OnStep cost/kit: Here's one of the cheaper kits with wifi, and serial support: https://www.stmbluepillkits.com/ ($35 There's a hand controller which is $22, both plus shipping https://baheyeldin.com/astronomy/onstep-esp32-smart-hand-controller-shc.html which is probably $10) Then you can either bend a metal bracket, or use a 3D printed one. (I use a modified version of I think this one: https://www.thingiverse.com/thing:1833860 Look at any of the EQ-5 types here for ideas: https://onstep.groups.io/g/main/wiki/Showcase%3A-What-Users-Built-With-OnStep ) Then add stepper drivers (Several, I think TMCs are the preferred one, but I use DRV8825s which are like $10 for 5, as I have a lot from 3D printing.) and Stepper motors (0.9 degree ones are $23 on amazon^1, but they are cheaper elsewhere) and Belts/Pulleys (Depending on how you want to, I think most people use 60 tooth ^2 and 20 tooth, or 20 & 80 for gear reduction. Plus the belt.^4)
This is a quick response for examples on cost, so if you would like to do it, I can get together what I'd do at this point. (Probably look into which TMCs are setup right.) I haven't included a few things like sensors (<$10) for doing PEC correction, or another motor to allow it to do things like focus (which is REALLY HANDY for AP, though most scopes will require a custom solution. EX: https://www.thingiverse.com/thing:1260785)
So for this, $350 + bracket + 35 + 22 + 10 + 224 + 28+7+13 = 501 + shipping.
^1 https://www.amazon.com/STEPPERONLINE-Bipolar-Stepper-0-9deg-62-3oz/dp/B00PNEQMLY/ (242)
^2 https://www.amazon.com/RuiLing-Aluminum-Timing-Pulley-Printer/dp/B07QWRGCLY/ (28)
^3 https://www.amazon.com/Timing-Pulley-Wheel-20Teeth-Printer/dp/B07RXJ5GVG/ (17, with spares)
^4 https://www.amazon.com/2GT-Timing-Belt-Closed-Loop/dp/B014KKRSLY/ (113, with spares)
If you think that things are worth potentially doing, I can give you a list that's got a bit more time into it.