A lot of eBay sellers ship internationally.
I would be very cautious with AliExpress and even some Chinese sellers on eBay – there are a lot of fakes.
Best is find an eBay seller that does not have all 5 star reviews, does not sell swimsuits, alarm clocks, among sata cables and LSI controllers, but sells other stuff that probably came from the same server they disassembled and now sell parts from.
There are a lot of hardware recyclers who do that – unixsurplus is one of them, I got a bunch of stuff from them (actually, I searched on ebay, but invariably ended up buying from them)
Look at the pictures – if you see new shiny LSI controller that never was in the server for $30 – it’s fake. You want an actually used one, from the working server.
I agree with posters above, avoid these: they are built to price, corners cut everywhere, performance is horrible (they are based on ASMedia ASM1064 – 4-port SATA bridge and JMicron MB575 SATA 1-5 port multiplier). It will “work” technically, but you won’t get any reasonable performance or reliability.
The old server SAS controllers cost about the same or cheaper, but in contrast, they were not built to price; they are expensive products built for reliability, but obsolete, and that’s what drives price down.
Same goes about network adapters. Don’t buy modern ASUS crap, buy old server NIC. You maybe pay with slightly worse power consumption, but in one-off setting it does not matter; reliability however will be drastically different.
Edit:
I recommend reading hardware guide from the TrueNAS community, even if you don’t plan to use FreeBSD and/or ZFS: advice there is solid: Hardware Recommendations Guide | TrueNAS Community
I’ll quote here what they have to say about sata port multipliers:
SATA Port Multipliers
These really deserve a category of their own. They are universally atrocious. Beyond that, there are a few additional reasons why they would never be a good choice:
• Intel SATA, which is the only 100% reliable SATA solution, explicitly does not support port multipliers.
o Even WD knows this. When they released a hybrid 120GB SSD/1TB HDD, they could not use a port multiplier to connect them both to a single SATA port. They were forced to use a custom controller that handled both spinning rust and NAND flash and mapped the first LBAs onto flash and the rest onto disk.
• The most common application for SATA port multipliers are eSATA chassis. Those are also universally atrocious in their own right, with issues from bad cooling to dodgy power supplies.
• They are cheap alternatives to SAS expanders and little more than a cash grab.
• Many also do even more horrible stuff, like hardware RAID for the enclosures mentioned
above – yes, on tiny chips with essentially no resources. Yes, they are a disaster.