My recommendation is not really low supply, currently about 10 mil, but
Vanillacoin is the ONLY coin that:
- Has random ports and encrypted connections so your ISP sees is normal SSL traffic while monitoring your ports. No other coin does this
- Has full, staking mobile wallets that allow you to move your wallet.dat to your PC from your Android and iOS wallets. No other coin does this
- Requires only 1 confirmation on Poloniex (other than BTC, which also requires 1 confirmation)
- Only coin to have near-instant 0 confirmation transactions without master nodes. No other coin has done this
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If you really need a low supply coin for some weird reason,
TRI has under 60,000 coins available and a less than 50 BTC market cap, but I haven't been following it lately so you'd have to look into whether or not it would make sense to invest.