That camera being a point-and-shoot with a proprietary lens adapter - your aftermarket lens options are going to be VERY limited.
It requires this lens adapter:
and looking at the B&H's accessory list under it, it shows only 3 lenses (the Wide Angle one you have, and 2 other telephotos). If B&H doesn't have it...it's doubtful you'll be able to find it elsewhere.
Unfortunately it looks like you already have the closest you can get. You could always take wide shots, and then distort them with Photoshop to make them look fisheye.