This KGuard All-in-One Security System drops from $499.99 to $249.99 to $199.99 using this $50 Mail-in Rebate at Tiger Direct. Plus, the shipping is free. This is the best price we could find for one of these systems by $93. It comes with 8 night vision cameras, a 500GB hard drive and a DVR that allows you to view your home cameras over the internet on your computer, tablet, or smartphone. There is no sales tax (except FL, IL, NC, TX, GA, SD and ID).