Currently the cheapest price can be found at Redbubble with 18.04 € in a top quality:
Classic, wide, straight cut.
Heavy fabric (180 g/m2 / 5.3 oz.), Plain colours made of 100% against indentation of pre-treated cotton, grey-melted from 90% cotton / 10% polyester, denim blue mottled from 50% cotton / 50% polyester.
Double stitched hems and neck band for longer durability