When we got our trailer I had only one key for the storage compartments. It is a generic Southco R001. I started searching on the internet and the dealers that had them wanted anywhere from $8-15 ea plus shipping. I choked and e-mailed Southco. They sent me the name of a wholesaler which had a decent price ~$2 but I had to buy a dozen. I went with a pile of keys.
Just the other day I was looking on Lipperts site for something else and found the Southco R001 keys for $2.66 ea.
Just a heads up if you need spares.