I think I paid $50 on sale for a pair of Cabela's bibs.....I've used them three seasons on the ice and every time I shovel snow at home. They work great.
They look like these (only a different color)....
The only ones left in the bargain bin though are Clint sized.
(and yes, I know they are classified as rain wear but I've never had a problem being cold in them and I've even warn them with just shorts on underneath while shoveling snow).