We tried to bring the barrel accessory program to Canada, and we were well on our way to getting it done, including send smiths for hands on fitment training... AND THEN... The Big Green takeover! It probably won't happen now. Unchambered barrels won't be shipped because the problem has always been fitment liability.
For those Handi fans among us, this has never been an issue... Barrel fitting has never been a difficult issue to conquer. I have fit many dozens of barrels to SB2 receivers... And only came across one that was worn too far from the OEM spec tolerances that it couldn't be fit. When you are just getting started on Handi swap barrel sets, the easiest way to get it done is to just buy a whole second gun and then fit the two barrels to one frame. I have a barrel fitting tutorial that I can send to any interested party that expresses this via PM. It is best to have multiple SB2 frames on hand... I have three dozen and always have several options for a tight fit without doing fitting. For the most part fitting can be taken care of at three points; First the barrel lug hinge surface. Second the latch shelf. Third the barrel to breach face surface. Most commonly, the lug surface (hinge pin counterpart) might need material removed or built up. These are simple tasks that can be performed by anyone... They don't require hiring a gunsmith.
As for barrels, if you don't want to buy a whole second (or thrid, or fourth, or fifth) gun... Keep an eye on the EE, as they do come up from time to time.
If you do buy a whole second gun, get a synthetic model as there is a pretty good market for synthetic Handi stocks ($70) and for SB2 frames ($90)... And this will help recoup some of the initial investment.
For comparison, the total cost for a accessory barrel in the USA is $160-$170 with shipping both ways... You are not far behind to buy a whole gun and sell off the unwanted NEW parts... Several vendors sell new Handi's at $280 and have those on sale occasionally.