The cheap option would be a Sigma 105/2.8 Great image quality and fairly well built. The downside is, it is slow to focus and a bit noisy. If you can live with that it is a great lens. I used to own it but in the end upgraded to...
I'd recommend you spend the extra and get the Canon 100/2.8 macro - but that much extra in image quality but the ultrasonic focus motor really makes a difference for quick and quiet focussing.
The 60mm f/2.8 also has USM, but when shooting macro stuff, I'm almost always focusing manually. So the motor really only matters with non-macro shots.
The cheapest option: reverse your lens.