If you're on a thrifty mission, your best bet is this Ppla Romper. It's a terrific piece, while not very expensive. It is also worth looking at this Mavi Jeans Playsuit. It's a product you'll love which also doesn't cost too much. You may also want to look at this Splendid Romper. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for a happy medium, consider purchasing this Romper. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth checking out this Elie Tahari Jumpsuit. This product is ultra popular and, just as importantly, not very expensive. Take a look at this Tadashi Shoji Jumpsuit too! Great value for your money.