These are brand new, still sealed. There are 30 cards, double sided, for grades 1-4, and are number PP376. Currently on the Lakeshore website for $49.99 plus shipping.
Per the website -
Our double-sided write & wipe boards are a great tool to help students learn place value skills! Each board features space to illustrate place values to the hundreds on one side…and a chart on the other so kids can visually represent each number in a problem, then regroup to work out the answer! Set includes 30 sturdy plastic boards; each measures 9" x 12". Write & wipe markers sold separately.Item # PP376