Basic rules with HDMI, cables less than 3m, the gauge of the cables are quite small but not a problem. 3-10m cable gauge may increase, this is good, and to be expected. Cables over 10m and less than 30m then expect an equalizer at the receiving end this creates a cost point.
Avoid the super expensive monster type cables, its all marketing sh1t and you pay for nothing.
As a price guide if you are paying significantly more than the following prices then you are having your tit pulled, mind you some may find that appealing.
Also be aware that the HDMI tradename machine control who and what makes HDMI raw cable stock, there are not many sources, they are all controlled, this includes who supplies the likes of Monster, its all the same cable under the skin even if Monster put a think coat on it, bottom line is the above prices are what you should pay, if its more then you are being ripped, you have been warned.
Sadly HDMI seems to be a rich picking for shonky retailers.