I need to buy a Roku 2sx unit & can’t find one. Can anyone help.
Why buy such an old unit? If you need composite output, the Roku Express + has it.
That ROKU model is actually no longer supported as it’s too slow. The Express+ is a good choice for those who need composite connections.
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I have one. It still works. I’ll happily trade it for a brand new Roku Express + devices plus the cost of shipping. 
If you must have a Roku 2SX unit, you’re best off looking on eBay and Craigslist, with the usual caveats. Hardly any chance of you finding one at a regular retail outlet.