So.. I found some bugs in your plugin, although I really like it!

First of all, I found a typo: ReSSource has to be reSource. Mybe it is useful to release the locale file if it isn't released yet.

2nd: The shop doesn't recognize carrots or potatos if I type CARROT or if I use 391 (The id)

3rd: I would like to be able to set the maximum of a spawner. For example: There can only be 10 gold on a gold spawner otherwise they keep going on.