Here are expressions for asking about prices :
- How much is it ?
- How much does it costs ?
- What does this book/sweater/shoes/dress/etc costs ?
- How much is this book/sweater/shoes/dress/etc ?
- How much is that altogether ?
- How much do these pens costs ?
- How much will that be altogether ?
If you as customer do bargaining you could use this expression :
- How about ................. dollars ?
- How about ................. rupiahs ?
- Can you make it lower ?
- Can you lower the price?
- Can you give me a discount ?
- Is there any discount ?
- That's too expensive, how about Rp. .............. ?
- Oh, that's rather expensive, how about ................... ?
- Is there any discount for this dress/shirt/sweater/etc ?