السرير ده غالي والشباك ده رخيص.

ده means this here.

In Egyptian Arabic, ده is the common masculine singular demonstrative. So:

• السرير ده = this bed
• الشباك ده = this window

Because both السرير and الشباك are masculine singular nouns, ده is the right form.

That is the normal Egyptian Arabic pattern.

English says:

• this bed

Egyptian Arabic usually says:

• the bed this → السرير ده

So the word order is different from English. This is one of the most noticeable features of Egyptian colloquial Arabic.

A learner-friendly way to think of it is:

• noun + ده / دي / دول

Examples:

• الولد ده = this boy
• البنت دي = this girl
• الكتب دول = these books

Because in Egyptian Arabic, the usual way to say this + noun is:

• الـ + noun + ده/دي

So:

• السرير ده is the natural way to say this bed
• الشباك ده is the natural way to say this window

You normally do not drop الـ in this structure.

So even though it may feel redundant to an English speaker, it is just the normal Egyptian pattern.

Because Arabic usually leaves out the verb to be in the present tense.

So:

• السرير ده غالي literally = this bed expensive
• natural English = This bed is expensive

And:

• الشباك ده رخيص literally = this window cheap
• natural English = This window is cheap

This is very common in Arabic. The is/am/are idea is understood without saying it.

If you wanted was or will be, then Arabic would use a verb.

Because Arabic normally puts descriptive words after the noun, and in this sentence they are functioning as predicate adjectives:

• السرير ده غالي = This bed is expensive
• الشباك ده رخيص = This window is cheap

So the structure is:

• subject
  • description

If you wanted an adjective directly inside the noun phrase, like the expensive bed, that would also come after the noun:

• السرير الغالي = the expensive bed
• الشباك الرخيص = the cheap window

So in Arabic, adjectives generally come after the noun, not before it.

Because here they are not being used as the expensive bed or the cheap window. They are the predicate of the sentence:

• This bed is expensive
• This window is cheap

So:

• السرير ده غالي
• not السرير ده الغالي

Compare:

• السرير الغالي = the expensive bed
  here the adjective is part of the noun phrase, so it takes الـ
• السرير ده غالي = this bed is expensive
  here the adjective is the predicate, so it does not take الـ

That is an important difference.

A rough pronunciation is:

es-sarīr da ghāli wesh-shubbāk da rakhīṣ

A few helpful notes:

• السرير is written with الـ, but because س is a sun letter, the l sound of الـ is not pronounced. So it sounds like es-sarīr, not al-sarīr.
• الشباك works the same way, because ش is also a sun letter. So it sounds like esh-shubbāk.
• غ in غالي is a deep throaty sound. Many learners approximate it with a French-style r.
• خ in words like رخيص is like the ch in Scottish loch or German Bach.

So the whole sentence flows roughly like:

es-sarīr da ghāli wesh-shubbāk da rakhīṣ

و means and.

So:

• غالي والشباك ده رخيص means
• expensive, and this window is cheap

In Arabic writing, و is attached directly to the following word:

• و + الشباك → والشباك

In Egyptian speech, it is often pronounced something like we or w, depending on the sound that follows.

Yes.

For a feminine singular noun, Egyptian Arabic usually uses دي instead of ده, and the adjective often takes a feminine ending.

Examples:

• الترابيزة دي غالية = This table is expensive
• الشنطة دي رخيصة = This bag is cheap

So compare:

• السرير ده غالي = this bed is expensive
• الترابيزة دي غالية = this table is expensive

The same idea applies to رخيص / رخيصة.

Yes, this sentence is clearly Egyptian Arabic.

The most obvious Egyptian feature is the demonstrative coming after the noun:

• السرير ده

In Modern Standard Arabic, the demonstrative usually comes before the noun:

• هذا السرير
• هذا الشباك

So an MSA version would be something like:

• هذا السرير غالٍ وهذا الشباك رخيص

So the main differences are:

• Egyptian: noun + ده
• MSA: هذا + noun

The overall meaning is the same, but the structure sounds distinctly Egyptian in your original sentence.