das Sonderangebot
special offer
A product or service that is sold at a reduced price for a limited period of time.
Die Kaffeemaschine habe ich für nur 50 Euro im Sonderangebot gekauft.
I bought the coffee machine on special offer for only 50 euros.

special offer
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special offer
A product or service that is sold at a reduced price for a limited period of time.
Die Kaffeemaschine habe ich für nur 50 Euro im Sonderangebot gekauft.
I bought the coffee machine on special offer for only 50 euros.

The word is made up of 'Sonder-' (a form of 'besonders', meaning special) and 'Angebot' (offer). So it literally describes a 'special offer' that differs from the normal range of products.
Jede Woche hat der Supermarkt neue Sonderangebote.
Every week, the supermarket has new special offers.
To express that a product is available at a reduced price, you almost always use the preposition 'in' with the dative: 'etwas ist im Sonderangebot' (something is on special offer) or 'etwas im Sonderangebot kaufen' (to buy something on special offer).
Diese Jacke war letzte Woche im Sonderangebot.
This jacket was on special offer last week.
Common verbs used with 'Sonderangebot' (special offer) are 'haben' (to have), 'finden' (to find), 'nutzen' (to use/take advantage of), or 'wahrnehmen' (to take advantage of). They describe discovering or buying the reduced product.
Wir sollten dieses Sonderangebot nutzen, solange es gilt.
We should take advantage of this special offer while it lasts.
offer / deal
'das Angebot' and 'das Sonderangebot' can both refer to something you can buy. The difference lies in the price and the time period. An 'Angebot' can simply be a product or service offered at a certain price; sometimes it is cheaper, but not always. A 'Sonderangebot' is clearly a special offer at a particularly low price, usually only for a short time. The words can be confused because shops often use both words for reduced prices. If you want to emphasize that something is discounted, 'Sonderangebot' is more precise.

Im Supermarkt kauft Lena Kaffee im Sonderangebot.
At the supermarket, Lena buys coffee on special offer.
Das Angebot für den neuen Laptop gilt nur bis Freitag.
The offer for the new laptop is only valid until Friday.