My D’s MS ChE is funded at Rose-Hulman. They offer up to 100% tuition grants (based on GPA) and $3000/ quarter graduate assistantships. Their website has full details.
Unfortunately for the OP, however, they do not appear to offer a biomechanics concentration for the MS ME degree. The three ME concentrations they do offer, as well as their MS BME, are also outlined on the web.