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For full context, see here:  
<https://www.docdroid.net/dEbqqGI/img-20170816-0001-new.pdf>

The sentence in question is from line 13-14:

> ほかにいいの、ありませんか。

In context of this dialogue, there's a high amount of uncertainty on my side
about the possible meaning of this sentence. xD  
I could imagine that it's something like "Don't you have one which is good
besides that/good in other aspects as well." Something along these lines. This
ほかにいいの is just too cryptic for me...^^
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grammar particle-の
What does this expression mean in this context?
The first half of your guess is pretty much correct.  
I can also see the implied "in other aspects" since the flow suggests he wants
something with better examples.

I might make a direct translation to "Do you have any other (product)
suggestions?"
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This is a fun one. For added context, I read the example that you had from
beginning to where you had issues. I'm going to include the whole quote here
just so that we can have be on the same page.

> でも、そのフラット社のは例文が少ないですね。意味の説明だけじゃなくて、例文がたくさん載っているのが欲しいんです。ほかにいいの、ありませんか？

My translation:

> But this dictionary doesn't have very many example sentences. I want one (a
> dictionary) that has not just the meaning, but also lots of example
> sentences as well. Do you have any other suggestions?

Here's how I broke it down:

**ほかに：** `Other`

**いい：** `good`

**の：** I understood this as a shortened form of のやつ or `thing/unit`

Putting these together, I understood `ほかにいいの、` to mean `other good units.`

**ありませんか：** `Don't you have?`

Literally translated, you have:

> Don't you have any other good units?

It makes sense in context, but I think that a better translation is either
what I had above, or this:

> Do you have any other good units that would fit my needs?
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