You can sell then on the internet if you have a site.

Prices will depend of the size and variety. Large birhous gours can sell around 10 buchs. But they have to be fully matured and dried.
Ornamenta gourds have little market value, as they have very little craft value and can be grown easier.
Last year my birdhouse gourd plants died too early but this year they are ok so far. I
I give away most of mine and do some craft work(make containers..etc)

I was thinking of selling the birdhouse for 3 dollars. I have always wanted to try to make something from them but I'm to afraid that they will turn out bad. My sisters got the "crafty gene" and I didn't. My vines are doing well this year. I have snakes over 3 feet some straight some curled. I have eggs galore, dont know what to do with them. Maybe this next year when they are dried, I will try to make something, or just give them to the kids to play with again.

Very good! Let them stay on the vines till frost, or when vines die to fully mature. Then take them home and treat them (wash outside)with mild chlorine solution to prevent molds.
let them fully dry. Then you can use them for crafts. With birdhouse gourds, only the larger one have value to convert them into birdhous(martins) You can also paint them, carve them and burn them, make containers for dry things or water.