Try a sample pack. Card stock - Uncoated, comes in just about any color you want. ONLY, with a minimum order of 250. Write or e-mail your request. This slightly thinner stock will work with most printers, and, once it's on the book, is virtually indistinguishable from 10-pt stock.
All covers are the same price.
Get the book, the press of your choice, and a sample pack of 25 covers for one low price. Items printed on your regular- size home printer can be glued to the base piece and then covered with a laminating sheet to hold everything in place. Available in white only. You can still get these covers copied. You'll just have to design your covers so that either the front or back cover has a white border or frame that occupies any area past 17 inches.