Get Online.net Kidechire for Paypal or Bitcoin/Dogecoin/Darkcoin
Looking to rent-out my last spare one, feel free to PM if you're interested.
Specs as you may already know:
VIA Nano U2250 CPU 2 GB RAM 160 GB disk 1 Gbit network connection
Additionally you get a 100GB FTP backup account, so it's about ~260GB of storage in total (with the server itself).
As for the price I'm looking for 12.8 EUR/quarter in Paypal;
alternatively you can pay in Bitcoin, Dogecoin or Darkcoin, and as a bonus get a small 5% discount.
You will need to have an Online.net account, via the "outsourcing" feature the server will appear there and you'll be able to monitor/reinstall it, or create tickets to Online.net in case of any problems.
Of course you need to respect the Online.net ToS and abuse reports received from them against the rented server will likely result in termination w/no refund.