how much time does it take to cross the border both ways though? If you value your time it could negate the benefit, but of course one would also have to do some other shopping while down there too so it all could add up ok.
The border waits are what always discourages me from doing it.
Avoid weekends. Avoid when many are off from work/school.
We ventured down Thursday just after 8am, 3 booths open, minimal wait. Came back 12:45 Thursday afternoon, 3 booths open, minimal wait.
Some go thru the process to use the NEXUS lanes... We haven't bothered to do that.