Hi,
Just a 5 cents worth of opinion. I have my own preferences and reasonings.
I think cables are cables. Most cables are made of copper, i'm not sure about Monster but that's the material most of your cables are made of including top brands like Mogami, Canare, Belden etc.
I think spending so much money on a "bass" cable isn't worth it if the materials are the same. People in the industry still rely on the top names for their cabling so at the end of the day if your cable material isn't the same as the "bass" cable down the signal chain, the signal would be lost.
I hope that sheds some light. I'm not an aficionado of "bass" cables or cables that claim to enhance certain frequencies, i just trust top name brands to give the quality they are famed for. I'm currently using Belden cables with Neutrik heads for live and studio use and they have served me very very well.
Cheers!
PS. Anyway to answer your question, from what i know Sinamex use to carry Monster cables. I'm not sure about now. If not you can try Hung Brothers, i think.