You'll be able to get these in department stores all over Crete (and probably Greece as well). They're inexpensive, cheap actually. As soon as you get them home and wish to feel as if you are having a sip of retsina in a Greek taverna, take them out, fill them up and there you are.
What to buy: Small wine glasses and tin wine jugs.
The glasses are REALLY durable. Actually I just dropped one of these on my kitchen floor and the glass remained untouched! Don't try this at home ;-)
What to pay: Very, very little indeed.
What to buy:
You just have to buy a piece of the famous Cretean blue pottery. It can be found in multiple shops both in Hania and all over Crete, it's both beautiful and useful. Not to mention the fact that it's an impressive local souvenir.
Never wash your blue pottery in a dishwasher - you'll waste it :-(
What to pay: You can spend as little as EUR 1 for a small ash tray and as much as... infinity ;-)