biofeedback for posture

I want a device that will prick me whenever I slouch, as a way to compensate for my brain's shortsighted discount factor. This should be fairly easy to make mechanically. Another requirement is that it should be easy to disable.

web host

My web host is disappearing all of a sudden. I just spent the last several hours working on an emergency backup. All the files are backed up, but it's still unclear whether my wiki will be saved.

In any case, now I now need to find a new host. The main requirement is that it be able to host MediaWiki (basically PHP and MySQL). Also, I should be able to FTP and SSH to the server. I'd also like to have a capacity of about 1 GB, but less may be okay too.

Finally, I would prefer to not pay more than $5/month. Any recommendations?