That is really difficult to say with the limited info at hand. You can buy a shelf company or CC (not sure of the cost, google for it), or set one up from scratch. For a PTY from scratch it can vary depending on who you get to do it — I used Highway Corporate Services to set up my PTY (they also do CCs). Browse around their site, and CIPRO's for more info.
Trickier thing is whether the product needs protection, and if you want to register trademarks etc. etc. This is all HIGHLY dependant on what you are selling.
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