Are replacement blades easy to find for these trimmers?

Reviewers across r/cardmaking flag this as the single biggest long-term cost. Fiskars wire-style trimmers use cheap, widely available replacement blades; the Fiskars ProCision and most Swingline and X-ACTO guillotines use self-sharpening blades that rarely need replacement. Off-brand titanium cutters like Firbon ship with spare blades but quality of replacements is hit-or-miss.