I don't see your math at all. There is 6.5% Florida tax added to the
Disney Store tickets. I have the Cdn store brochure in front of me. For sake of arguement, let's look only at the basic MYW adult offered from the store versus the mousesavers undercovertourist amounts:
Disney Canada:
3-day MYW base adult = $225, plus tax = $239.63 CDN
3-day MYW base child = $190, plus tax = $202.35 CDN
5-day MYW base adult = $240, plus tax = $255.60 CDN
5-day MYW base child = $200, plus tax = $213.00 CDN
7-day MYW base adult = $245, plus tax = $260.93 CDN
7-day MYW base child = $205, plus tax = $215.13 CDN
Undercovertourist (all taxes and delivery included):
3-day MYW base adult = $213.95 US
3-day MYW base child = $178.95 US
5-day MYW base adult = $217.95 US
5-day MYW base child = $181.95 US
7-day MYW base adult = $218.95 US
7-day MYW base child = $184.95 US
With the US dollar so weak, both places should be selling at the same amount, and that's not the case. The Disney Store still offers Canadians very little on the dollar exchange.
Also, you can order any number of days from undercover, not just 3-, 5-, and 7-.
For my family of 4 -- 2 adults and 2 kids -- my 7-day MYW base tickets came to just under $808 US. If I had purchased these from Disney Canada, the total would have been $958.50 CDN.