None of these prices include labor, just parts.
Set up something ad hoc running porteus kiosk or something w/XBMC. Cost = that PC you have lying around the office +
21" touchscreen monitor $200-300 + locks $15-25
Out of the box kiosk retails for about $2k
ipads are retail devices and I usually see them cabled improperly, esp at health clinics, and it's an OSHA violation. The usual anti-theft kiosk stands (Pyle and some other companies make the more popular ones) costs about $150-200 beyond the ipad cost. FFS make sure it's cabled properly PLEASE.
It's probably easier/cheaper to run digital signage like Xibo, Concerto (that would be on constant loop)