The early 2008 Penryn MPB 2.4s had been $1349 for quite a while. The Santa Rosa 2.4s have been less, but I can't remember exactly. Easiest way to discern the difference in the store listings is by hard drive size. Penryns have 200GB.
This list helps tell the difference. By most accounts, the Penryn is around 10% faster even though clock speed is the same. Penryns also have the multi-touch keyboard.
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www.lowendmac.com]