What does おとくな　けいじばん mean?


I was playing ポケットモンスターファイアーレッド (Pokémon fire red) when I noticed that this
appears when I start reading most of the signs:

![おとくな　けいじばん](https://i.stack.imgur.com/MtYBJ.png)

I've searched for it in a couple of sites, and it looks like けいじばん is bulletin
board, but I didn't find what おとくな means, nor what the sentence is saying.




It's the na-adjective 得【とく】 with a polite prefix お. As a na-adjective it means
"profitable", and お works in various ways, but here you can think of it "for
you". So お得な is as a whole like "(that) profits you".

> [![enter image description
> here](https://i.stack.imgur.com/Li3Gq.png)](https://i.stack.imgur.com/Li3Gq.png)  
>  [jisho.org: 得](https://jisho.org/word/%E5%BE%97)

Thus お得【とく】(な) is a very common fixed phrase in the real life. The definition
below reflects very well what settings they use it frequently in.

>
> [![jisho.org](https://i.stack.imgur.com/ohPOv.png)](https://i.stack.imgur.com/ohPOv.png)  
>  [jisho.org: お得](https://jisho.org/word/%E3%81%8A%E5%BE%97)

If you don't know how to use a dictionary or what a na-adjective is, please
read some beginner material.

