Also remember that if you purchase the Butterflies of the Sinlahekin Wildlife Area (either the normal cover or gray cover), you will receive an automatic discount of 20% off a Pocket Guide when you add both to your cart. There are only 2 "normal cover" and 13 "gray cover" BSWA books left, so get one before they're gone! I had so much trouble publishing the BSWA the first time around, and printing costs have skyrocketed since then, so I probably will never be able to republish in print. I'm still investigating the digital book process but it will be some time before I update everything if I go that route.
The species names used in these books are a little out of date, so be sure to also grab a copy of the Summary of Washington Butterflies checklist available for free download here, last updated 3/6.
Thanks for your support!