I think this is the page you are looking for:
http://store.apple.com/at/browse/home/shop_mac/mac_accessories/power
Oh, I see your dilemma.
Your store is not carrying the 60W power adapter. Just buy the 85W power adapter and use it instead. Both produce the same Voltage, the 85W just has more extra capacity. It will not overcharge anything, and since it runs cooler, it may last longer. That is what I did when I needed a new adapter, and i can assure you it works great.
Intel-Based Apple Portables: Identifying the right power adapter and power cord--US
For instance If you have a MacBook (13-inch Late 2009) that normally uses a 60W adapter, you can also use an 85W adapter with that computer. You would not use a 45W adapter with that computer; it would not provide enough power for that MacBook. Using an adapter of higher wattage than the adapter that came with the computer will not cause the computer to charge more quickly or otherwise operate any differently than using the adapter that came with the computer.
-- similar articles are available in other languages if you prefer
