If you're looking for a thrifty option, this Button-Up Shirt will fit the bill. It's a popular choice, while not very pricey. Another strong contender for your wardrobe is this Oxford Shirt. While the price of this piece is not very high, it will certainly attract a lot of attention.
For something in the middle of the price range, you're in luck with this Chinti & Parker Button-Up Shirt in stock and waiting for you. You are guaranteed to fall in love with this piece. It's also worth looking at this Loveless Oxford Shirt. This product is extremely popular and, just as importantly, not too pricey.