The first two chapters can be read for free on Google Books.
Purdue students can join SIAM at no cost: graduate students qualify because Purdue is a SIAM academic member institution, and any student who joins the Purdue SIAM student chapter also gets free membership. Membership brings discounts on SIAM conferences and journals too.
SIAM has provided students in ECE 60141 / BME 66100 a coupon code for 20% off the list price at the SIAM bookstore. The code is posted on the course Brightspace page under Announcements.
Note: only one discount may be applied per order, so use the 30% member discount instead if you have joined SIAM.