the one you find on shopee are usually not legit ones.
better straight free piracy instead of paying for pirated software.

the original license are expensive, you can find pricing at their website. https://asean.autodesk.com/products/autocad...ab=subscription

if you want a cheaper version of autocad, you can use autocad LT which is around rm1600 something a year but typically they give discount for longer term. call them lah to nego lower price.