How to buy dulse?

hi there,i am in Montreal and love to buy some dulse for myself, at the store
one small back is 4.49 and i can not afford it so please can you give me a
price if i want to buy more,i am not sure if there is a expiring date if so i
will buy less

I will love to hear from you and appreciate very much your approach and care
for the product

Thank you