Might try either:
theriflescopestore.com or opticsplanet.net. Both sell sunshades but you may have to match another brand because I've not seen Bushnell sunshades before. But that doesn't mean they aren't made. Both Nikon and Leupold also make sunshades for their scopes and you might be able to match up a sunshade by size. I think my last Nikon sunshades ran me like $24.95. Hope ya find what you are lookin for.