The page (at the above link) with the various pricing options is the only page that is using Snappy Checkout. Inside of the Snappy Checkout admin, I added four products -- so each could have a separate price. And there is a buy button linked to each product.

Pricing for Snappy Checkout is the same no matter how many tiers your item has. It's 2.9% plus $0.30 (for Stripe/PayPal) and 2% or $0.50 (whichever is less) for Snappy Checkout's fee.

If I did not answer your question, then please email me at Mike@SnappyCheckout.com with some more details.