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@cdrmb Thanks for reaching out!
To answer your question, no, none of the sleeping bag liners REI sells have full length zippers. The Cocoon Cotton Bag Liner/Travel Sheet has a 3/4 length opening with velcro closure, and the Sea to Summit Thermolite Reactor Fleece Liner has a quarter zipper.
The REI Co-op Helio Down 40 Sleeping Bag is a really lightweight sleeping bag/sleeping bag liner that has a full zipper and might be worth checking out, depending on what kind of conditions you are sleeping in.
Hope this helps!