I quite like these http://www.aclighting.com/bargains/view.asp?ref=658.
At £350 + VAT (circa $825) they're a little cheaper and can still be used in your theatre.
Not sure why they are in the "bargains" section of the A.C. Lighting website. An un-chromed Patt. 23 in perfect working order will set you back about £25 (~ $50).