The webpage is simply an advertisement describing Zenith's product line.

Zenith makes hundreds of different carburetors of different prices. To get an exact price, you need to know WHICH Zenith (in this case which type 228) by tag number that you want. There is no general price.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop