yah, unfortunately i agree with him. THe best you can get for under 100 dollars is just anything off ebay called a "fisheye" attachment. they wont be perfect by any means, but i have one and they work OKAY. it wont really give you super wide fisheye images but it'll still give you the effect.
i think .22 is the widest, because as far as i know, thats a magnification factor, so you get .22 of whatever lens you attach it to., since you're using an h5, i guess that would mean you have the adapter tube thing , i'll post a couple pictures i took with mine on my H1 (should be the same results as an h5)