I would definitely spend a few extra bucks in gas to get to a Home Depot than try to find something from Bellette's.
We have had bad luck every time we've gone in to any of the Bellette's locations (Jaffrey, Peterborough, New Ipswich). They typically never have anything we need. We are always told we have to order it or find it somewhere else.
The staff is far from helpful. Most of them don't ask you if you need help - they just assume you don't. When asked, they kind of just "shrug" saying they can help. And then they begrudgingly help you.
The products are way overpriced. They DO have Benjamin Moore paints though, which is the only reason we've gone there.