Hey TW...........maybe you can find someone on craigslist selling or giving away their stuff.
As far as ingredients; It is my opinion that most of the online shops sell a lot of the same stuff and your cost savings will come from those who offer reasonable shipping.
This is an issue that bothers me in all types of catalog/internet purchases.......
Let's say an item is $8........it is a small item weighing less than a pound.
Many places, since they are "set up" with UPS, will charge you over $10 to ship this item. Of course, small items can be shipped effectively with the USPS for half that amount.
If a store doesn't offer the best value in shipping (or the options for me to choose the bast value), I don't do business there.