> The process of soldering of single sided PCBs is more expensive
> than that of double sided PCBs if to be done properly, I believe.

I don't know how you come to that conclusion. My observations of mass 
soldering of single sided PCBs is that it is quite probably considerably 
cheaper than doing double sided. A solder bath machine would be easier to 
run than any form of reflow solder machine that needs to do both sides of 
the board, and would produce as good a job as any reflow solder machine, 
from the results I have seen. 

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