If you want something inexpensive to use while you save your money for the real thing, I've seen Nine West totes in that style in gray patterned coated canvas. They change their styles every few months, so you might not be able to find one now. It was around $90 or so in the summer.
Dooney and Bourque make bags that seem 'inspired' by LV designs and I saw one recently that looked like a NF - it was around $300-350 though so you might prefer just to wait.
My friend just ordered a LAMB that is similar. It is gorgeous!! I think many designers, high and low, have tote style bags, you just have to search around. I know many designs are similar between different designers but I'm sure it's because really, how many different bag shapes can there really be?? Like pants.