Ez a páros gyertyatartó jó alku.

Because Hungarian usually leaves out the verb to be in the present tense, third person when you are saying that something is something or is some quality.

So:

• Ez a páros gyertyatartó jó alku. = This pair of candlesticks is a good bargain.

But in other persons or tenses, the verb appears:

• Én fáradt vagyok. = I am tired.
• Ez jó volt. = This was good.

So the missing is is completely normal here.

Yes, ez means this, but Hungarian normally uses a demonstrative + article pattern before a noun:

• ez a könyv = this book
• az a ház = that house

So:

• Ez a páros gyertyatartó = this paired/double candlestick or this pair of candlesticks, depending on context

For an English speaker, it can feel like this the..., but in Hungarian this is the standard structure.

Because the article depends on the sound that follows:

• a before a consonant sound
• az before a vowel sound

Here the next word is páros, which starts with p, a consonant, so it is:

• ez a páros gyertyatartó

Compare:

• ez az alma = this apple

So ez a and ez az are both possible, depending on the next word.

Páros can mean things like:

• paired
• double
• in twos
• matching as a pair

In this sentence, it tells you something about the type of gyertyatartó. Depending on the real-world object, it may suggest:

• a pair
• a double candlestick
• something meant to go as a matching set of two

So páros is acting as an adjective here.

Because Hungarian very often forms compound nouns and writes them as a single word.

Here:

• gyertya = candle
• tartó = holder

So:

• gyertyatartó = candle-holder / candlestick

This is very common in Hungarian. English sometimes writes similar things as one word, two words, or with a hyphen, but Hungarian more regularly joins them into one compound.

Alku means bargain or deal. In a shopping context, jó alku means:

• a good bargain
• a good deal
• a good buy

So the sentence is evaluating the item as financially worthwhile.

A useful thing to remember is that alku by itself can also refer to bargaining or a deal made through bargaining, but in a sentence like this, jó alku clearly means good bargain.

Hungarian adjectives are much simpler than English speakers often expect in some ways:

• they do not change for gender
• they usually do not change in attributive position just because the noun is plural

So:

• jó könyv = good book
• jó könyvek = good books

Here:

• páros modifies gyertyatartó
• jó modifies alku

Both stay in their basic form.

Hungarian adjectives can change in some situations, especially when used predicatively with plural subjects:

• A könyvek jók. = The books are good.

But in your sentence, the forms páros and jó are exactly what you would expect.

Hungarian word order is more flexible than English word order, but it is not random. It often reflects topic and focus.

In this sentence:

• Ez a páros gyertyatartó is the topic: what we are talking about
• jó alku is the comment/new information: what we are saying about it

So the sentence naturally means something like:

• As for this pair/double candlestick, it’s a good bargain.

You could change the word order for emphasis, but the neutral version is very natural as given.

Grammatically, it is singular because gyertyatartó is singular.

That can feel surprising if the meaning involves a pair. But Hungarian can describe something as a pair or paired item without making the main noun plural.

So the grammar is singular even if the real-world object involves two matching parts or a pair.

A rough guide is:

• gyer-tya-tar-tó

A few helpful points:

• Stress is on the first syllable: GYER
• gy is a soft Hungarian consonant, somewhat like the d sound in some pronunciations of during
• ty is also a soft consonant, somewhat like the t in some pronunciations of tune
• the final ó is a long vowel

A rough English-style approximation is something like DYER-tya-tar-toh, but that is only approximate. Hungarian sounds gy and ty do not match English exactly.