The Hong Kong Snack House in Pacific East Mall in Richmond is pretty good, I can report, for a little bite or even a whole assortment of goodies to combine to make a meal for your brood.  They have excellent Vietnamese sandwiches that come on good, crusty French bread with crispy veggies and a sweet/sour sauce for around $3.50.  Try the combo.  We have not yet worked our way through the entire menu, but are able to vouch for a few other things, like the egg puffs and waffles, but I would advise eating these items while walking around the mall.  The sandwiches travel fine, though.  This place has a display table of brightly colored snack items that we have not yet selected from, and it was decked out in spades for Chinese New Year.