I have an old computer that I use for storing and streaming my media. It has an attached external drive. I would like to increase my storage and build something that could be extensible to at least 100TB. I am not worried about backup.
I looked and I think I need a HDD rack or enclosure. Some people gave me links to good deals on ebay and some other sellers but they are based on the US and shipping fees are high. I saw this HDD enclosure and it seems to be what I am searching but I don’t if they are good.
Do you have some advices for me?

For 100TB it’s worth looking into a dedicated storage server – there are tons of them available for cheap. labgopher makes it easy to track sales on ebay by price/storage/ram/whatever.
The majority of servers there are shipped from the US and shipping for me is triple the prices.
Lab Gopher no longer works, but there’s rackrat.net. It has more countries as well. Cheapest server with >=100TB bundled storage is $1655 at the moment.