The cost is broken down by type of component:
If you click on the "Details" link after a graph, you can see the exact list of components, and cost calculations for different quantities. The prices shown at the end of each calculation are the totals for all the devices, not only one.
The next graph is for using an ATmega48V instead of an ATmega88V.
Finally, this is the price of the ATmega48V circuit if the serial cable is omitted. This considerably reduces the cost. Note that we still include the serial interface on the main board, because a device without it would not be programmable at all.
Shipping by regular mail is also available from Digi-Key, and is considerably lower in cost than FedEx, but also slower (it takes about one week, compared to 2-3 days). Note that shipments by regular mail use a different customs process in Argentina, which may require you to handle the import formalities personally at your nearest customs office, and where individuals pay a 50% tax on the sum of component and shipping cost (as opposed to 15-25% for companies or when FexEx or similar do customs on your behalf).
When ordering from Digi-Key, specify that you want to receive everything in a single shipment. Otherwise, your order may be split if any items are delayed, and you are charged for more than one shipment.
I picked these two companies because of the quality of their online catalogs. I'm a regular and generally happy customers of both, but have no interest in their commercial well-being besides that.
Note that the catalog prices may have changed since this calculation was done. Also, some prices come from a manually maintained price list, which is based on past purchases, and may be wildly inaccurate.
The price estimates include the battery, but they don't include consumables used in the build process, such as solder, acid, toner transfer paper, alcohol, flux, glue, etc. Most of these things are normally sold in quantities that last for dozens if not hundreds of projects, and I expect that people who are interested in building this circuit will already have most of these things.
If ordering components from abroad, since shipping is expensive, you may want to order some spare parts, e.g., extra chips, in case something goes wrong. It is also very easy to lose small components, e.g., resistors. They are also quite cheap, so ordering some extra supplies is generally a good idea.
Werner Almesberger 19-OCT-2006