I went ahead and purchased the two practice exams directly from Pearson. On the upside, they're definitely similar.
On topic, I head Cliff's PCAT test prep is a good test, but doesn't include the updated materials. Barrons is really old at this point. Opinions on the Kaplan stuff is here and there.
In regards to the Pearson tests, you only get two, and I wish I could get a better idea of where I'm scoring. It told me I got between 65th and 85th percentile, but that's a huge range. Anyone who's taken the PCAT know where getting 150 out of the 200 questions correct usually lands you on percentile?
Still a month to prepare!