ok, no one else has answered so i'll have a go - it all depends on what they are looking for, obviously. Toronto has a huge H&M but i didn't actually go in so i don't know prices. I found that clothes in Toronto generally weren't that cheap, but thats prob cos we have got used to primark/supermarket prices. Have only been to Boston for a day to walk the freedom trail, so didn't take much notice of the shops, but generally have found usa cheaper for clothes and shoes than canada. Have a good trip.