The best replacement for cardstock is cover stock.

The best alternatives to cardstock are rated as following:
★★★★★  cover stock
★★★★★  photo paper
★★★★  construction paper
★★★  card stock
★★★  tagboard
★★★  cardboard
★★  poster board
★★  chipboard
★  resume paper
★  bristol board
  posterboard
  copy paper
  text paper

Your alternative for cardstock is not listed? Suggest!
Speaking about cardstock, one probably shouldn't forget about silhouette cameo.

Other search terms related to cardstock and their ratings are:
★★★★★ silhouette cameo
You have in mind a companion for cardstock and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cardstock in all years. Click on graph for more.
cardstock
cover stock
photo paper