Why is it that before I sign into my amazon account, the price for the 32 gig is $25.57 + $4.95 shipping. When when I sign into my account it shows $30.73 with prime shipping. Any idea why the difference?
You're seeing varying prices because the page loaded the product from different sellers/shippers.
For future reference, before you order something on Amazon, you should always look to the right side of the page and check out the "More Buying Choices" section so you can find out who is selling the cheapest one. Yesterday, for example, I was buying a kitchen item and the seller that Amazon presented me with had the price of about $13 with Prime shipping. I checked the More Buying Choices section, and saw that another seller had it for under $12 with Prime shipping.
Hope this helps,