I have put all of my audio lectures on sale for 50% off for the rest of the term (sale ends 11:59 pm, April 30, 2017). There are audio lecture series for Statistics 1 and 2, Calculus 1 and 2, and Linear Algebra. See below for free
samples (I give you about 10 hours of my audio in these free samples!).
If you are interested, just reply to this email and I will send you a PayPal invoice. You can pay the invoice using your PayPal account or, as a guest, with a credit card. The audio will emailed directly to you within 24 hours of receiving your payment (usually much sooner; as soon as I receive confirmation from PayPal of your payment).
Since these are audio
lectures, it is important that you have a recent edition of my book, so that you have something to follow along with as you listen. You don't have to have the current edition, however. Any editions from the last 2 or 3 years should be fine. If you are not sure if your book is adequate, ask me in your email, and I will let you know.