The following are the features of the Limited Membership ($12/year plan). I highlighted the portions you asked about. You can request more than 30 swaps per membership year after 30 requests then the swap fee will kick in, unless you use PBS printed postage.
The Limited Membership unlocks the following features to make your book swapping experiences here that much better:
Request 30 Books per year Without Swap Fees - No swap fee for your first 30 swaps per year! ($14.70 value) (note: you'll earn a Free swap fee each time you use PBS Printed Postage to send a book)
200-item Wish List - 100 more than unenrolled (A la Carte) members!
Courtesy Postage Fees - Enjoy the convenience of our Printed Postage without the 55-cent Postage Printing fee, once every quarter ( = once every 3 months; up to $2.20 annual savings).
Directed Delivery - When multiple copies of a book you order are available, we’ll determine the most expedient route to you. We take into account several factors to get your book to you as quickly as possible, putting special emphasis on the closest geographical location for “Greener swapping”!
Multi-Copy Requesting - If you’ve ever wanted to order more than one copy of a particular book for your book club, classroom or reading group, this feature is for you. As a Limited member you can choose exactly the number of copies you need from the available books, and order them all simultaneously. No more ordering only one at a time! Perfect for teachers, librarians, book clubs and more.
Participate in Discussion Forums - Limited Members may post in Forums (A la Carte members are read-only).
Access to a Private Discussion Forum for enrolled Limited Members.
Badge on your member Profile, identifying you as an enrolled Limited Member.