I usually can get cute stripey ones at Wal-Mart in a brownish-beige for boys and two or three other stripes, plus solid pink with lettuce edges and baby blue solid - all at WalMart in US.
My Walmart usually has a 3 pack in a "boy" or "girl" color like that. I didn't have much luck this time-supply must be low.
Thank you-I was able to find some good deals at Kohl's online and should receive 9 in the mail soon :). That will give me some to try out some cute designs.
If we don't know what country you are shopping in, our suggestions might not be much use! If you were in Australia, I'd suggest trying Big W :)
May be we should all start our comments with both date and country or even end with ' best wishes from ' in my case ...beautiful New South Wales Australia.................Ann
If you are specifically looking for the colored onsies, why not try your hand at dying some. They would dye the same as a t-shirt. It wouldn't take much dye either. If you are not familiar with dying anything, try a box of Rit dye on something like an old t-shirt. Just be sure to launder it without fabric softener before trying. Then you would have the exact colors you want. As for where to find onsies, I'm no help; sorry. You might try Amazon.com and walmart.com. Good luck.