A couple of points -

1. A non-store member gets 40 free listings per month. It changed from 30 in about May last year.

2. The free listings start on the 1st of the calendar month, so you won't have to wait a week, as they are already available and have been since yesterday.

3. There are periodic, usually at least one a month, free listing offers for non-store holders.

4. The current one started on 26 Dec, but runs until 6 Jan. Maybe avail yourself of same.