Go to hpb's web site and do a search for Life mags and vhs to see if they carry them in their inventory as a start.
HBP accepts anything ever printed or recorded, including magazines and VHSs. Back issues of magazines and VHS aren't worth much any more these days. They make their offer for everything you bring in. If you dont like the offer you don't have to accept and can take your items back home with you. They explain very well why they offer you what they are, if you ask why.
Thanks! Your answer is awaiting moderation.