You can get them cheaper on ebay (No minimum charge, no excessive shipping) if you can weight about 2 week.
1N4728
A couple of them are at 1.22 buy it now free shipping for 10. You could even use the best offer and try to get them down to 99 cents.
There's currently an auction for 30 3.3v Zeners (1/2watt instead of 1watt though) but no part number for 1.49 or best offer.
Ebay is often the best for one-off part orders. Unless you are ordering 15+ dollars worth of parts, shipping from web-stores hurt.