It seems to vary at the stores I visit. For awhile the prices got a lot higher, but I think their sales went down and now they are back to what they used to be.
The only thing I've shopped for regularly over the years is old sewing machines (which I fix up to donate to a local non-profit that teaches quilting classes to the disabled). I've found that prices vary dramatically from one Goodwill to another, so I confine my visits now to the ones that tend to have reasonable prices. When their prices went up for about a year, I quit buying until the prices came back down.