No food saver bags do not effect the taste themselves. They do however help protect the foods from going bad. That of course can ruin the taste a great deal.
Amazon (online) sells almost anything, and yes it does sell food saver bags. I've seen some that go for less than $20, but the average price range would be $20-$40.
Many people who have invested in a vacuum food saver have noted how well they work. People have said that it is an excellent investment and that it pays off.
Yes, all food coloring has a taste. I did a science expiriment and it concluded that they all do... but they taste different according to the personMy mom said the blue tasted like sour milk and red...