I don't think you'll get much interest if you set a $40 price. More likely to get a sale via auction with bidding starting at maybe $4.99 with free shipping (First Call Postage). I suggest you scan the lot with a decent scanner so stamps are sharp, open an account on eBay
, select "Selling" and upload your scans to eBay
using the easy online guide. List ad under "Stamps > US > Back of Book" and write a nice description. Good luck!