I don't know of anyone local, but we order 3 different thicknesses of bubble foam as well as bubble wrap and other packing supplies through a vendor on taobao. Price is decent and shipping is reasonably quick. If you want their taobao ID I can dig it up.
Not too bad. Price for doubles is reasonable, although when we wanted to buy them at the advertised 40% price during the day, we were told only beer, not cocktails. Regardless, they were still about the price of some other places' happy hour prices, so I can't complain too much I guess. Service was definitely more prompt and attentive than most places.