Not the same one OP has, but let me go ahead and recommend this one: https://www.amazon.com/Go-Pet-Club-Brown-F2081/dp/B008SM4GUW/ref=sr_1_10?keywords=cat%2Btree&qid=1557273862&s=gateway&sr=8-10&th=1
We've actually got 2 in our house right now, here's Ozzie enjoying one of them.
Lysine can help keep symptoms at Bay! I add the powder to wet food whenever my boy george has a flare-up.
It's super cheap!! https://smile.amazon.com/dp/B00BERPOP4/ref=cm_sw_r_cp_apa_i_pP4LFbABC25CM
The 50mm is a little tight at about 2-3' away from the cat... but it works fine for me! Check out my imgur galleries to see how close I get with the 50.. I often have to back up a little to get the entire cat in the photo... so when making the decision, take in to account how much of the cat, and its surroundings you're trying to get... here's my normal cat gallery ----> https://imgur.com/a/MnFEo
I bought it from the German Amazon ( here ), but there are a lot of products like this out there. It seems to be called "Trixie 43140". I also put another blanket into it, because my cat likes blankets.
Did you know that if you type "unicorn horn" into Google the 5th autocomplete is "unicorn horn for cats"?
http://www.amazon.com/Accoutrements-Inflatable-Unicorn-Horn-Cats/dp/B00BPMMQDG
The reviews are the best part. I could read them all day.