Congratulations on the new arrival, hope you have a lovely, healthy grandchild. Pleased to say my DD and DiL often look in charity shops and on eBay. DD had our first DGC, can't believe he's 10 this month, and we bought fairly expensive Bugaboo, pram/ buggy combo - which was never used much as DD usually had them in a sling whilst babies then walking or on a scooter or bike after that. DDiL was very happy to have it for her two - although I offered a new one, and now my niece has made good use of it, her second still in it. That's what I call value.
In our area there is a charity called Baby Basics who provide for Mums to be who are in need, a Moses basket ot baby bath is filled with nappies, clothes (can be 2nd hand if in good condition) and other items for baby and a few treats for Mum too, if there's one in your area I'm sure they'd be glad of any donations.
This poor planet of ours is in crisis, people getting rid of perfectly good stuff just because they can is consumerism gone mad in my opinion.