I need to buy some CHEAP B&W film in 120 format. Looking here, I understand Shanghai is the least expensive and only available on ebay now. I'd rather not use ebay but if I must, I will, I guess. Can someone recommend me a good seller, as I have zero experience? Also, looks like most of them come from overseas like Hongkong. Most dealers say tax and duties are buyers responsibility. In US, what is your experience? Say for 20 rolls at about $25 dollars, what do the authority/shipping companies do?