if a customer wants faster delivery of the item, can I bill them for the higher price that i need to pay the postal service once the sale is through?
You cannot demand a higher price than you have advertised, but if your customer asks for faster delivery you can give him that option with the appropriate pricing.
Or, you can offer more than one shipping option, some fast, some cheap.
Be careful with the second, however, because many/most people will pay for the cheaper option and expect the more expensive service. Just human nature.
I wish to have my customers have the option of priority mail 2-3 days.
Why? Are your customers complaining? Are you using the very slow but very cheap Media Mail? Is this a Christmas thing?
post these types of charts on each individual listing.
KISS
Use Calculated Shipping. Period. No fancy charts that your customers won't read or worse will mis-read. All you need to do is put in the weight and dimensions of your parcel (which with relativly similar items like DVDs is easy) and the program will cross-reference the buyer's postal code, the dimensions and the service chosen and spit out the correct shipping cost. You can test it by putting in a few codes youself. (I use 9010 for USA but you could use K1A 0A6 for Canada -- that's our Parliament Building here in Ottawa.)
