There are a number of options
I know some folks who refuse to pay it, spent loads of time and energy. They have a PST/GST exempt card, and show it to the retailers to avoid paying. They received this due to being a status Native, or by way of claim. They had to disavow any 'services' paid for by said 'taxes' however.
There are also retailers here who know I am a Freeman and do not charge me, though I do not know that they ony do it for me.
My path was one of less controversy and much less resistance. It was a result of thinking and studying, not emotional reaction defending a previously held belief. You can see what I mean here in rumps post and how he makes a declarative statement about what we can and cannot do. He says this without even trying any other options, yet is so sure his is the only one. THat is the childishness I constantly refer to.
I told them that me paying the tax was not an indication of consent, and that if they did not want to ensure that I could easily avoid paying it, by giving me a card I could flash, then they would have a duty to use the money they collect for what I deem. In my case, I claimed that the sales taxes I pay must go to health care and that the fact that I pay the sales tax, for it is next to impossible to avoid even if you do not consent, means my health care costs are covered and if they did not wish to do that, we would need a forensic accountant to examine this whole security of the person thing.
So I pay sales taxes, and I get health care covered, and I am still a Freeman-on-the-Land. That is the agreement I established with the people in the Provincial government here, by way of a Claim of Right.
Easy Peasy eh? When you do not start off with your mind shut down, and your position already claimed and ready to be defended.