Shirts from Bergdorf Goodman
If you're after a thrifty option, your best bet is this DL1961 Sleeveless Button Down Shirt. It's a popular item, while not very pricey. It is also worth considering this Derek Lam 10 Crosby Button-Up Shirt. It's a product you'll love which also doesn't cost the earth. You might also want to consider this La Perla Shirt. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look no further than this Paige Denim Shirt. This item doesn't cost the earth, but definitely deserves a place in your wardrobe. It's also worth considering this Current/Elliott Denim Shirt. This product is ultra popular and, just as importantly, not very expensive. Alternatively, opting for this Alice + Olivia Short Sleeve Button Down Shirt is a nice choice as well!
If you have enough to afford it, look at this Stella McCartney Denim Shirt - a great luxury choice. While you're at it, also have a look at this Balenciaga Button-Front Shirt. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious Akris Punto Oxford Shirt? Yolo, right?