If you're on a thrifty mission, look at this GUILD PRIME Playsuit. It's a wonderful piece for a reasonable price. Another strong contender for your wardrobe is this Closed Playsuit. While the price of this piece is rather reasonable, it will definitely attract a lot of attention. You may also want to look at this Macgraw Playsuit. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for an item in the middle of the price range, look no further than this Carven Romper. This item doesn't cost the earth, but absolutely deserves a spot in your wardrobe. It's also worth taking a look at this Alice McCall Playsuit. This piece is extremely popular and, just as importantly, not very expensive. Look at this Isabel Marant Etoile Playsuit too! Great value for your money.