I too share your quest for rare Spiderman hologram cards, or quite literally any type of rare Spiderman memorabilia.  They say the Internet has it all, and most often this is true. However, I recently found a rare Spiderman hologram at my local flea market. I was quite shocked to find this card at the bottom of a box, covered in old magazines. One never knows that he or she may find at a flea market, thus this may be an ideal place to start.  Holograms, or other rare memorabilia can increase substantially in value as time passes, and can actually be a splendid treasure to pass down to your children.