I dunno, for the budget you're looking at I would probably still go with fleabay's big drive resellers. goharddrive offers a decently long warranty period on their enterprise stuff and has 8TB HGST drives in your budget.

I don't know how easy they will be to come by for you, but Orico has a decent 4 bay enclosure in USB-C, I got one a few weeks ago and am using it with OpenMediaVault on a 1L PC. If I need more drive bays, I can grab another and chain them because they include a USB hub. Yottamaster has a similar model, but they offer a firmware update on their site to turn off the automatic sleep function. It's at least a couple of model numbers to look around for. They do pass unique drive information through to the host, which I understand can be an issue for some enclosures.

https://www.amazon.com/ORICO-Enclosure-Aluminum-Expansion-SSD-3549C3/dp/B0BY26NFMR

https://www.amazon.com/Yottamaster-Enclosure-External-Capacity-USB-FS4C3/dp/B08DLTTDTV/