how to show price on store list?

hi..
I have separated a product table and a price table,
because One product can have many prices.
Users choose a bag_size from the drop down box.

ex) a prodct "a" has 2 bag size(1,2)
     a price of 1 is $4.99
     a price of 2 is $5.99

ex) a product "b" has 3 bag size(1, 2, 3)
     a price of 1 is $3.99
     a price of 2 is $4.99
     a price of 3 is $5.99

now I'd like to show a list of products with prices of each.

index(store)

i got it working by

<%= collection_select "bagList", :price, Price.find
(:all, :conditions=>["product_id=?",
product.id]), :price, :bag_size, :prompt =>"Bag Size" %>

thanx...