Here we have UK Card Crafts White ultra smooth blank "rounded" business cards.
These business cards are printable and you can also stamp on them.
Please check that your printer can take this size card as it may be too small for most printers.
They are made by UK Card Crafts so they are excellent quality.

These business cards have rounded corners.

You get 1000 white ultra smooth blank business cards that are 85mm x 55mm and 250gsm.