since I made a software application, I was able to do it all for free (other than printing of the folio, and the display for final marking which came to around $100). I just used an old phone I didn't use in my display to demonstrate the software.
jeez,what is your major? why do you need to spend that much?
at the moment I've spend just under 100$, and don't think I'll be spending more than 200 in total. I'm making an architecture model - but you should be repurposing some items as well, not just buying new things every time. doesn't always look the best when you're talking about sustainability in your portfolio but don't reuse anything (obvi depends tho)