You can buy K-Tag from Alientech. The information on how to flash it in Bootmode is included with the Tool helpfiles and depends on the type of MED17 you are flashing. A few pins on the plug and a bootpin inside is the most common.
"Is there a more cost effective way?" Yes of course. Ask GOOGLE "Where to buy KTAG" :) This effective way not to discuss the rules of this forum. Regards.