The Kreg Rip-Cut circular saw guide on Amazon.com (https://www.amazon.com/Kreg-KMA2685-Circular-Saw-Guide/dp/B073PFYN4T/ref=sr_1_2?tag=quackdeals-20) - cut up to 24" is on sale for just $39.98. Free Shipping!
(https://m.media-amazon.com/images/W/MEDIAX_849526-T1/images/I/71T278BaQDL._AC_SL1500_.jpg)