For only 2 pieces, I recommend Radio Shack (if they have what you need). Almost any part is available directly from the manufacturer as samples – but typically only to design functions of OEM manufacturers, who are buying components in quantity. Still – it doesn’t hurt to ask! Digi-Key is a good source of a wide variety of parts – as well as a guide to which parts may be readily available, and which may be hard to find. The only hassle with them for smaller purchases is that they have a minimum order amount – I think $25 now. When I select a part from a manufacturer’s website or catalog, I’ll often look up the part on Digi-Key’s site, to make sure I’m not picking a part that will be hard to source. If their stock status is “0” quantity, that’s a red flag. As a side note to those using Digi-Key or Newark, etc. exclusively, there is a good site that will check both price and stock status of multiple sources – FindChips.com. You just enter in your part number there, and you’ll find out which distributor has stock at the best price.