From Fourier Expension we know that the foundemantal harmonic contains the frquency of the original signal. So if you applay a square wave with f frequency and then low pass filtered with a sharp edge filter you would have a sine wave with the frequency of original square wave plus a dc component. But except for very low frequencies the sharpnes of LP filter's edge would not be sufficient to suppress much of the other harmonics. So the low cost solution depends on your needs. If some superpositioned sinusoids with low magnatiude are acceptable for your application then you should try to generate a square wave and then low pass it with a (n) order low pass filter.
Regards.
Ertan Balaban