An electronic shelf label (ESL) holder, including an attachment member portion to be secured to a supporting surface, such as a C-channel, a holder member with protrusions for removably receiving and supporting the ESLs and, optionally, a cover member pivotally carried by the holder member to overly and protect the ESLs. The holder member includes a lip extending from at least one of the top or bottom fingers of the holder formed of flexible PVC material that is flexible relative to the remaining portion of the holder and is compressible for providing a tight fit of the ESL to the holder. The flexible lip is utilized in combination with a backing member which, in one embodiment, is a flexible PVC bead that extends along the length of the holder and, in a second embodiment, includes a relatively broad or wide pad of flexible PVC material that further provides a seal against the battery or other electronics of the ESL.