Do you know anyone that can sew (and preferably has a serger)? I can make a simple tank leo in about 20 minutes, and that includes cutting it on and sewing the elastic in. Use a 40% off coupon at JoAnn Fabrics to get a discount on mystique or performance wear. You only need a yard or less depending on your size. I do this for my girls all the time. It's easy and cheap. Using the 40% off coupon, you can get a yard of mystique for $6.80, which is enough for me to do a leo for both of them. So, I can get two leos for about $7 and an hour of my time.
Also, one time I went to a garage sale and found a box of leos and I bought all of them. I've only seen that once, though. $1/leo!!! It was awesome.