Where to Find Cheap PC Parts for a Budget Build?

I’m looking to build a PC on a tight budget and need help finding cheap PC parts. Any suggestions on where to get affordable components like CPUs, GPUs, RAM, and motherboards? Also, is it worth looking at refurbished or used parts? I'm aiming for decent performance but don’t want to spend a lot. Are there any trustworthy websites or stores that offer good deals regularly? How can I make sure the parts I get are reliable and not outdated? Thanks in advance!