WTB : Astrophotography kit

[vickiesaurus]

Hi all, I am Brunei based and will be visiting Singapore this week.

I am looking for the following if anyone has it for sale!

ZWO AM3/AM5

ASIair mini

Samyang 135mm f/2, or William Optics Redcat51 (or similar)

Bahtinov mask, dew heater

Trying my luck secondhand before I consider buying new.

If you have any of these to sell, please let me know