Plenty of older one's available second hand:

http://www.3dprinterclassifieds.com/...ers/objet-260/

http://www.3dprinterclassifieds.com/...et-3d-printer/

A 250 went for £10k a few months ago on UK eBay.

I've no idea on Stratasys' flexibility but I would really take list prices with a pinch of salt till you talk to the company, explain your situation and see if they want to do a deal. I've paid less than 50% of list prices on newly released kit many times.

(going to remove my prices from above)