If you need small electronic parts such as a AND gate in TTL logic, you may read on, how to find the parts you need and where to buy them.
To find out what part would fit your needs best, check out the manufacturers websites such as Texas Instruments:
- Logic Design Help from TI
- Then you may end up checking the specifications of a particular part, here the SN74ALS08: http://www.ti.com/product/sn74als08
To buy your stuff, go to any of the following websites (if you know another one that I didn't state here, let me know by writing a comment):
- To find the part I was showing in the example (SN74ALS08), simply search the site and it comes up with several form factors for the product: http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&KeyWords=74ALS08