I purchased the Francois Labet Cremant de Bourgogne Brut NV at Spec's for about $15. I served this as an aperitif recently. Though not particularly complex, I was impressed with the quality for the price.
In the glass, it was a pale lemon yellow with abundant bubbles. It had light aromas of fresh apple and a bit of toast. It was dry and crisply acidic. Perfect for a before dinner drink or to use in sparkling cocktails. We did not finish it that night. I closed it and put it in the fridge before dinner. Two evenings later, I was reading out by the pool and decided to pour myself a glass (okay, two glasses) and it was just as fresh and fizzy as the first night.
A good sparkling wine at a good price!