I have Cibie Z Beam's from the 70's/80's but those are discontinued; the currently available 7" rounds will fit the same. But yeah, they're not cheap. I bought my pair from a guy who got a spare NOS set when he bought a CJ7 project.
Just did a search and saw The Bus Depot has Hella H4's on sale for $60 bucks a pair. That's the best price I've ever seen on a pair of Hella's, I'll probably pick up a pair for my '66! Dad has a pair of Hella H4's in his '97 S10 (along with a relay harness and 80/100w bulbs) and they're amazing at night. The larger 7" reflector would be even better. At $60 a pair, that's cheaper than a single Cibie 7".
http://www.busdepot.com/0301600118