Where can you buy a line blower?

[brittmer]

I don't really understand why you need to blow the lines out.
I live in the midwest so it freezes every year. All I do is pump antifreeze into each return line, without removing the water, and when I see the antifreeze coming out I cap off the line and fill the rest with antifreeze.
The main drain I just pump antifreeze into the line until I see it starting to float out and then just leave it. Antifreeze is heavier than water so it stays in place.
This way may take more antifreeze, but then I don't have to drain the water below the lines, refill it in the Spring or buy a blower.
I have been doing it this way for about 12 years now and have never had a problem.