I recently purchased this Emax compressor and it is working quite well. It is not completely silent but a lot quieter than most compressors. It also has a small footprint and at the 8+ cfm it is able to keep up with the air assist needs of my laser. It can be found online for under $400.
https://www.homedepot.com/p/HULK-POWER-10-Gal-2-HP-Portable-Electric-Powered-Vertical-Silent-Air-Compressor-HP02P010SS/302691861