I have here a first small list of typical products on Crete or Greece, which a friend of mine has sent me. The prices are indicative prices and minimum prices, which can go up a bit.

Feta cheese:
Price: €8–12/kg

Olive oil (Extra Virgin):
Price: €4–9/L

Greek yogurt:
Price: €3–6/kg

Local Greek wine:
Price: €6–15/bottle (depending on brand and vintage)

Ouzo (traditional Greek spirit):
Price: €10–20/bottle

Honey (local varieties):
Price: €8–15/kg

Greek olives (Kalamata!!! or others):
Price: €4–8/kg

Baklava
Price: €2–5 per piece

Greek coffee (in a café):
Price: €1.50–3 per cup

Herbs (very good business!!(oregano, thyme, etc.):
Price: €2–5 per bundle

Mastic gum products
Price: €5–15 per pack (depending on type)

Handmade ceramics (plates, bowls, etc.):
Price: €15–60 per piece (depending on size and craftsmanship)

Leather sandals (handmade):
Price: €30–80 depending on design

Raki (Cretan spirit):
Price: €8–15/bottle

Tsoureki (Greek Easter bread):
Price: €5–10 per loaf

Loukoumi (Turkish delight):
Price: €5–10 per box (depending on size)

Handwoven textiles (rugs, blankets):
Price: from €50

Hand-painted icons (religious art):
Price: from €30 depending on size and artistry