This ceiling fan only works on medium speed and it should have 3. We replaced the switch and that wasn't it. Is there an easy fix? Should we just get a new one.

Generally losing speeds is a capacitor problem rather than a switch.

See CeilingFanParts.com Home

Is this something that my hubby can replace. Can we buy the part and does anyone know where and if it is expensive or not. Hubby can fix almost anything.

Put the original switch back in.

Contact Hunter Fan for parts. If they can't help you, try CeilingFanParts.com Home

Ceiling fan capactors - troubleshooting and resources - Ceiling Fans N More