Diy-ing from across the border- Help?

Just did a quick search and I think Michaels would be your best bet. They do have some dollaramas, no Dollar tree.

Also, sometimes places like thrift stores can be great for finding items! looks like they have a value village and a few smaller shops. (i've found alot of items at thrift stores. )

Michaels is great, I found a lot of wedding stuff at dollarama, but like Rayanne mentioned check Facebook marketplace for wedding stuff in his area, you'd be surprised how much people are trying to get rid of stuff from their wedding.

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I drive in (flying has been too unpredictable and expensive) so that was going to be most of what I'm doing, but I wanted to see if there's anything that I'd be missing when I'm up there. From experience, the less I have to truck through Border Patrol, the better.

If you're personally flying in every now and then, I would buy stuff in the states and bring it in your luggage. Even if your stuff is triggered by customs, trinkets like that won't be taxed much. Fredericton is a smaller city compared to most Canadian major cities (there are less people in the whole province of NB than a suburb in Ontario) so whatever selection you find up there will be limited compared to where you are.

I agree with what Rayanne said. I’m a big crafter and Michael’s is the only large scale store we have (no Joann or hobby lobby etc).
Dollartree is in Canada and they get a lot of the same supplies as the US store. You’ll have to check if they’re in NB
Dollarama is a Canadian dollar store and they have a decent craft isle as well

I would try the marketplace in his area. You'll get super cheap (already put together in some cases) decor that if you keep searching might work for you. Canada really doesn't have much besides Micheals as far as I know and I've lived here all my life.