patternreview.com also has a sewing machine review site and price is posted with the review.

Have you checked auction sites like Ebay? That might give you an idea what sort of price people are asking for.

I have a singer xl1000 embroidery machine. what would be a good price to ask if selling it outright? one place a trade in was $1000.00 another was $500.00 both quoted this week. I also have a magic box I could sell to go with it. not sure what to charge. also have an embellisher pd $600.00 hardly used. not sure what to charge. thanks. betty.