Hi mathew
Thanks for the comment!! I use a 4k IP module, you can find different models on aliexpress, 12 mp, 8 mp, 5 mp and different motorized lenses. My model is 8 mp but it depends on the use you are going to give it and your needs, so I recommend that you choose the one you like best on aliexpress. All have an economic price and give good results.
Regards