https://seattle.craigslist.org/see/ele/d/seattle-klipsch-forte-ii-speakers/7800716500.html
no affiliation...they don't get much cheaper than this. Condition TBD.
I have the same feeling about my Stax headphones...I would mention them, but I don't think the good ones are in his budget and certainly not suitable for portable listening...LOL
@jake08 I'd suggest you loosening and retightening the crossover connection screws first. Worth a try before sourcing new drivers. If they worked when you stored them, the drivers are still likely OK unless they were exposed to the elements for an extended period.
You may want to check some other styles for that use...lots of great folks here with good advice, but you may find more content specific to headphones here:
Head-Fi.org