It's been over 30 years since the Mac was released. Here is a slide show of the Mac through the years, with pictures, specs and prices. You'll note the first Mac sold for $2,495. Below each picture is a small box with the words "show more". Click this to get a description of what you're seeing. An interesting journey.
Now, if you're really interested in Mac history, here is a slide show of the MacBook over the past 25 years. The first Powerbook was introduced in late 1991 and sold for $2,500. A variety of the MacBook is what I've used over the years.
Looking at the intoductory pricing mentioned above, it seems Apple liked a starting price of around $2,500.