Go to ebay and search for "KEF LS50 Single". This will give you a few "single" LS50 speakers, a couple in white and one in black. Ranging from $535 to $641 shipped.
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For amplifier, you can get a brand new Emotiva PA-1 Balanced Class D monoblock for $299. (150 watts into 8 ohms, 300 watts into 4 ohm). The KEF speakers drop down to 4 ohm around the 200hz area, so this amp might be a little weak in the midbass area. I’m sure there are much better amps (higher current), but this was the cheapest monoblock I could find at short notice.
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Actually, there’s a guy on ebay selling three Emotiva UPA-1 (200 watt) monoblocks for $850. These would do much better than the PA-1 Class D. You might reach out to him and ask if he would sell one of them for something like $250 plus shipping. He might say yes, as it is harder to sell "three" amps than it is to sell "a pair".
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For amplifier, you can get a brand new Emotiva PA-1 Balanced Class D monoblock for $299. (150 watts into 8 ohms, 300 watts into 4 ohm). The KEF speakers drop down to 4 ohm around the 200hz area, so this amp might be a little weak in the midbass area. I’m sure there are much better amps (higher current), but this was the cheapest monoblock I could find at short notice.
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Actually, there’s a guy on ebay selling three Emotiva UPA-1 (200 watt) monoblocks for $850. These would do much better than the PA-1 Class D. You might reach out to him and ask if he would sell one of them for something like $250 plus shipping. He might say yes, as it is harder to sell "three" amps than it is to sell "a pair".