There is now the Ebay link along with Mixcloud and Soundcloud.

The Mixcloud and Soundcloud links just use the full web addresses and should look like the below:

Mixcloud:

[mixcloud][/mixcloud]

Soundcloud:

[soundcloud][/soundcloud]

Ebay just uses the item number i.e [ebay] 4644444 [/ebay]:

Jay X-treme rig

[ebay]291120418489[/ebay]

Enjoy!