If your currently on the BITX40 bandwagon of putting a kit together, or you have just recently ordered one. You will have soon noticed the kit doesn't come supplied with a speaker, what does one expect for such a good price! But for UK builders that don't like spending their hard earned cash. I have found an abundant source of small 8 ohm speakers from the highstreet discounter Poundworld.
Two speakers including cases for One Pound!!
The speakers are marketed for use with portable stereos, MP3 players, etc. A simple test to see if they were any good, I connected them to a reliable audio source and found although not HI-FI, they are perfectly adequate for use in the BITX Kit, or other QRP constructional projects.
They come packed in either Black or Silver.
Once unscrewed the back of the case, the speaker simply drops out to reveal a 5.5cm 2" unit.
A quick test on the multimeter revealed the value of 7.6 ohm:
Recently while out shopping I have visited 4 different Poundworld's, one as far North as Southport. All carried a plentyful supply of stock in their electrical area. I am sorry I cannot help my readers from overseas, but the unit is obviously made in China so try your Dollar shops.