We do hundreds of certificates of authenticity (known as COA) for artwork and this 250 Pack of Cardstock is easily the best bang for the buck. You can print on it like any regular paper but it has the sturdiness of an "important" piece of paper - like a certificate. I learned this technique and product as a middle school science teacher with the need to print a lot of certificates for science fairs. You can customize your own free template and then actually important the database of students right into the certificates hit print and voila - it's done - your only expense is this whole experience is the cardstock (assuming you are using free school or work ink).
I purchased two packages of the Staples Ivovy Card Stock due to the fact it was buy one get one free. I used this card stock to create invitations to several special events for family members. The sheets loaded into the printer easily and did not jam or get stuck. The ink printed on the cards wilthout smearing or feeling wet. The invitations looked professional done and elegant. Each card has a smooth finish. i was able to cut the cards using a paper cutter and the cards did not have any rough or rigid edges. I was very impressed with how the cards came out.