You may find it handy to make your own... All you need is:
1. Crimping tool - around $50
2. Cheap multimeter - around $10
3. Wire and terminators (4, 6 or 8 pin sockets)
4. Serial cards (about $4-5)
5. Breakout boxes (around $8 - handy when the wiring gets tricky - multiple wires to one pin), or when you share the gear between say a Vixen Autoguider port (non ST4 pin layout) and Celestron gear, and you want a simple convertor
Also if you want to run cable for long distances - LAN cable (cat 5) is brilliant, tough, cheap, very hardy and well constructed. I find it more stable than flat 6 or 4 pin cable - just use the wires you need!
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