Ziplock bags: extra large size, high quality. Where?

[dblaisde]

I need some large ones, say 10x16, 12x20 inches. Exact size doesn't matter. These bags are clear, freezer capable, and durable: the ziplock pulls don't fall apart after a month.

 

We have a brand in the US called "Hefty" which have these characteristics. They last for years.

 

 

 

Thanks in advance.

[impulse]

Same place, between Grand China Hotel and the pier on the river.  Post #3.  They sell by the kilogram.