I think these are the replacements. https://www.homedepot.com/p/Makita-3-1-4-in-High-Speed-Steel-Planer-Blades-for-use-with-3-1-4-in-planers-D-46230/203349981
I have this one and really like it. http://www.bebecollection.com/loaf-mold-tool/181-acrylic-soap-tool/acrylic-planer
You can change the blade I believe.
I've bought oils from them several times and have been happy with the product. I actually recommended them as an oil supplier on thedish. I've purchased coconut oil, refined olive oil and olive pomace oil from them with good results.