Qrates (https://qrates.com/) is a crowdfunding and e-commerce platform where artists can crowdfund vinyl pressings of their music. For crowdfunded releases, only as many copies as are pledged within the set time period are manufactured.
Example release URL: https://qrates.com/projects/21074
Example artist URL (can also be applied for labels as well): https://qrates.com/artists/ChillhopRecords

Update 8/14: I removed the autoselect component from this ticket because release URLs can be used for either crowdfunding or general e-commerce.