ClassifiedsBuy,Sell, or Swap for members only please. NO COMMERCIAL ADVERTISING - thanks...
And if you sell something like a boat through here - throw us a couple bucks for the site please :D
You could go to Home Depot or any other hardware store and buy a PVC pipe. They would likely even cut it for you. For less than $10 you could have 3-4 spikes. They work well for me!