Just announced over at Social Work Test Prep, the launch of a second 170-question ASWB practice exam. Each question comes with thorough rationales and a "suggested study link" to free information on the web to help you out if you're having trouble with--or need more information about--a particular content area.
Since the web does most of the heavy lifting, additional content-wise (no big books to tote around), the savings gets passed along to you. A quick poke around the pricing pages on other sites makes that clear very quickly. Want to sample SWTP for free before making a purchase? Here's a 10-question sample test. Enjoy.