Do you need an expensive HDMI cable for a 30 meter run?

30 meters is a long distance to run an HDMI cable. You are unlikely to find a great choice of options available at all. There are Cat6 HDMI cable extenders on Ebay under $25 and also a wireless HDMI extender that sells on Ebay for over $300. There was a 100 ft 30 meter for under $100 on Ebay. Amazon has a $200 retail 100 foot for $69 + S/H but many purchasers opt for the ones with built in signal boosterss