If that all fails there are some very simple ways you cna help, most shelters are always looking for the following:
Gently used dog and cat toys, leashes, and collars
Pet food and treats
Donation of coupons for pet food and treats
Also, many shelters have needs for things you may be wanting to get rid of anyway, old cellphones, office equipment, washers/dryers, microwaves, baby bottles, etc.