You can go even smaller:

amazon.com/dp/B00IAJGNNG  
youtu.be/jJGW5p2kG3Q  

ebay links can be shortened a lot too, i just mention it coz i put so many ebay links in my personal notes:

http://www.ebay.com/itm/Peepers-Claws-Orange-Crab-Md-20cm-by-Russ-Berrie-Brand-New/182547066358  

becomes

ebay.com/itm/182547066358

In my notes I prefer to put my own descriptions in. But in public forums it might be better to leave the original description text in there, as people probably prefer the original context.