The very first thought that comes to mind is to suggest you watch your local Craigslist or equivalent. There are deals to be had on even top quality resin skeletons throughout the year, if you're vigilant and quick. You're probably not going to find this beauty for $50 - but then again, you just might:
http://www.ebay.com/itm/MEDICAL-PLA...691702?hash=item1c6079fd36:g:R9AAAOSwoydWqXbk
OK, back to reality. "Budget Bucky" is about as high quality as skeleton as is practical for haunt use, and I've seen numerous new and used ones in the $100 - 125 price range via CL over the years, though never at a time when I needed one:
http://www.ebay.com/itm/Life-Size-B...865812?hash=item417f4162d4:g:ZQsAAOxyBjBTRzoN
I'm reasonably sure "Klaus" is Bucky under another name:
http://www.ebay.com/itm/NEW-LIFE-SI...ea92fbb&pid=100005&rk=2&rkt=6&sd=121877691702
Barring that, my personal favorite intersection of price and quality has been the 5' Barney. However, I suspect (based on the text description) that these may no longer be the heavier material like Bucky. I have a resin corpse skeleton of this size that I've always believed was Barney, but weights more like a Bucky. Now I'm just not so positive:
http://www.ebay.com/itm/Life-Size-B...hash=item3f27f64895:m:mDQmcYLjgzh50tGj2EJoAAA
If you need skeletons that can hang or stand, then I would advise going the Pose n Stay route. The lighter weight and more poseable joints offset some of the significant anatomical inaccuracies.