From what I've experienced, it's common to have mostly expensive texts (for undergrad level) that can reach upwards of $175. Occasionally there are free texts from professors at other universities, or just authors in general. But more often than not they're quite pricey.

Free would be great! I think a lot of students go the alternative route and torrent books or just Google to find their respective .pdf's without paying after they see the price tag at the campus store/amazon/ebay.