The filter could be a good alternative if the budget is very thin, but I think you'll be disappointed if you think your going to get the same magnification and the same sharpness as you would from a macro lens. Once you start to get really close the quality suffer greatly.
I certainly wouldn't expect it to be the same quality; especially not for $10.
Still, it might be fun to play around with while I look for a deal on a used nice lens. It seems the lenses everyone recommends are more in my budget when they are used.