Great choice. I actually ended up using the snap card more than the trifold which was my initial favorite. It's best for people who likes small/mini bags.
For a wallet that has bill compartment, yes its small. It's slightly taller than the small trifold but a lot thinner so it's easier to shove in small bags.
I bought these from coach outlet store. If you're from the usa, you can find them at coach website. If they're out of stock from their website then try find them at ebay, mercari, poshmark - sold by individual retailers. Just make sure you check seller's profile to make sure you're buying authentic.