There is the Jetrest.com (based in the UK) - it's sort of L-shaped to help keep the draft of ones neck. Does work, but in my experience does take a bit too much room for my liking (not a problem if it's a short trip, but when packing light for a 2-3 month journey it's size:benefit ratio doesn't work for me).
Ships to the USA (postage £12.95 ~ USD $22).
- Reasonably easy to get a discount off full price (PM if your interested)