UPS charges very high surcharges to some remote areas. It is why you need to use calculated shipping. If you ate that $100 shipping charge, I don't think that you would have been in the wrong to cancel given the buyers address would have no longer been reasonably serviceable after the Canada Post strike was announced. If I was the buyer, I wouldn't expect a seller to lose $100 in that circumstance.
Rather than de-list, use a shipping calculator. That way, you can still sell the items.
You have 146 items, which in terms of eBay is not a lot. If you do not have your items pre-weighed, you can likely group them up into "like items" and come pretty close to guessing their weight and dimensions. Almost all your items are small and likely to be under a KG.
I wouldn't put a bunch of time into weighing your items because the strike could last a day. Since all your items except a few are under 1KG, I would just stick with 1KG and 30x30x30 CM as a generic shipping size (or if you have a box you usually use for everything, go with that. The way UPS works, you're not going to overcharge customers with that, and if you somehow do you can issue a partial refund.
You may have to prepack and weigh a few larger items like the Xbox, but this is work you will have to do anyways in the future when it sells. So it's not really extra work.
I wouldn't edit your BIN prices or anything. I would simply suspend free shipping and charge UPS calculated rates. You don't want to nuts and redo all your prices, spend a bunch of time, and then the Canada Post Strike is resolved quickly. Even know people are less likely to buy your items without free shipping, leaving them up with calculated rates is better than removing them entirely. You may still make a few sales.
