 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 sensing and biosensing. Since then, there has been a lot of progress made in terms of sensing technology, including nanostructuring, optical technology, fluidics, and light source technology. This has led to substantial progress in SPR sensor evolution, but the cost of these sensors remains prohibitive for many applications. Recently, however, light source technology has become increasingly affordable, allowing for the development of low-cost SPR sensors. This review looks at the current state of SPR sensor development, focusing on light source technology trends. It also examines how these trends can be used to create low-cost SPR sensors. This article was authored by Brilliant Addie Prabowo, Agnes Purwadiantry, and Kochen Lu.