If you're budget-restricted, this Chaus Blouse will fit the bill. It's a fail-safe choice, while not very costly. Another strong contender for your wardrobe is this Nic+Zoe Blouse. While the price of this piece is rather reasonable, it will definitely attract a lot of attention. You might also want to consider this Gibson Blouse. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for a bargain, look no further than this Rachel Comey Blouse. This item doesn't cost a fortune, but absolutely indispensable in your wardrobe. It is also worth looking at this Theory Blouse. It's an attractive option both price and quality-wise. And do check out this By Malene Birger Blouse! It's a very popular item and good value for money.