An exhibition also needs some low cost items, such as postcards. This is always a balancing act for an artist - do you go for low numbers (up to a few hundred) at a high price that could sell out or thousands cheaply, but you end up having lots left over after exhibition?
Either way, you don't necessarily get your money back in sales!
I took a gamble and ordered 120 from moo.com. I was able to have 30 designs (4 cards each) done and they've just arrived today looking great! One worry less.
Phone line still down and internet at snails pace - Aaarrgh!