I use the Walker Talisman prior to playing every CD. I have found another dual bar magnet on Amazon which should do the same thing for $15.
Another tweak which I rely on (maybe until I get better speakers like the Von Schweikert VR55s) are Shakti Hallographs which aid my speakers dispersion characteristics. I didn't like my speakers until I tuned them with the Hallographs.
There are a multitude of tweaks which can work in a room. Treating the acoutical setting of a room first is 50% of the battle in hearing audio at its best.
Another really cheap accessory that I've used for six years is a Magic Eraser to clean my Benz Ruby 3. It truly cleans it and fast. I used to dip my stylus in a goopy material for the prior 10 years (I forgot the name) which worked but I didn't like it as much (not as easy to use).