Originally Posted by
Gaucho100K
Some more...
Baron B Extra Brut
Cristobal Blanc de Blancs
Escorihuela Gascon Peq. Producciones Rose
Baron B Unique
Vistalba Progenie Brut Nature
Eternum Nature
Zuccardi Cuvee Nature Blanc de Blancs
most of the above are in the $30-$50ish range....

I dare speak for the OP, but you're out of the range of the OP's cheap(ish) budget: sub US$20.