When I received my welcome packet there were 4 optional books listed for block 1. Things like "Calculating Drug Dosages", "Fluid & Electrolytes Made Incredible Easy", "Calculate with Confidence" and even a Dorland's med Dictionary. I have a Dorland's, but are these others something I should seriously consider? Anyone found them necessary or extremely helpful? Also...I went to the CGCC's bookstore website to see about the texts which sent me to a secondary website for medical books. The total was over $600 before shipping and there were no options for used texts. Anyone have advice about other websites they've used? I've "heard" about great deals online, but I don't know of any. Thanks.