I have been looking for one too. My hubby just bought me a brand new bike for my b-day and I am looking for a cheaper but yet more comfortable one than the ones they sell on line. I have actually been thinking of just getting the wire mess crates and lining it with a fabric pad since this may be best for a cool breeze for my babies. I will let you know what i see.
Good luck - if you find any good ones can you post them for me too? Thanks girl!