From what I've seen, the aluminum YJ/CJ radiators are around $130 shipped for a 2-core. 3 core are around $200.
On a similar subject, everyone makes a big deal about number of cores which makes it a bit confusing. I think I've seen up to 4 cores. 3 cores seem to be popular with copper/brass. Although 2 core is the norm for most OE radiators. Aluminum come in 2 core with some offering 3 core. I would guess that more cores allows for more surface area but then you're using smaller tubes.