Ergonomics needn't be expensive. I'm on an extended trip, where I'll be travelling out of the office for about 3 weeks. During this time I've got a lot of work to do and will be spending a long time working on my laptop in Hotel rooms. I knew this was coming. So I packed a spare full sized keyboard in my check-in luggage - safely trucked between my jeans and t-shirts.
On arrival here at my hotel I was able to set up this.
Using the bag for support I could unfold my laptop and make a good working area. It really is much nicer than sitting hunched over a laptop all day. I hope this helps if your travelling too. If you've got any other suggestions for travelling let me know, it would be good to share.