I'm in the market for a new pair of flats for the spring/summer.

Here's my criteria:
must be comfortable
no patent/leather because it makes my feet sweat
must be a breathable material or have "cut outs" to allow feet to breathe
prefer stretchy material because I'm pregnant and expect my feet to swell with the heat
I'm OK with a little wedge
I do like peep toes
Not a fan of loud prints
Causal but work friendly
Under $40!

I know it's a tall order but can you help me?