Last time I checked:
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Hardware (e.gm RaspberryPi or used old Laptop) and electricity cost are pretty affordable (100k-500k sats)
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Setting up Software is free (0 sats)
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Channel opening or using zerofeerouting (8k sats)
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The main problem is having a channel open. Nobody wants to open a channel to someone with 0 or only 2 other channels. Nobody opens channels below 1m sats. So minimum 3 million sats?
Has something of these points changed? Are there cheaper methods to get hardware? Are there ccheaper ways to open channels? Is there a place for small channels nowadays?