 Surface Plasmon Resonance, SPR, sensors have been around since the early 1900s, but it wasn't until the 1980s when they were used for gas and biochemical sensing. Since then, there has been significant progress in the development of these sensors, driven largely by advances in light source technology. Light sources such as LEDs, OLEDs, and laser diodes have enabled the development of low-cost, portable, and disposable SPR sensors. This review discusses the current state of SPR sensor development, focusing on light source technology trends. It also highlights the potential for further miniaturization, portability, and disposability of SPR sensors through the use of low-cost light sources. This article was authored by brilliant Addy Prabowo, Agnes Perwidaientri, and Kochen Lu.