Based on this product's specifications, here are some alternatives and similar models
Invoice duplicate form Michalczyk & Prokop Faktura wzór pełny A4 80 sheets self-copying (101-1E)
Summary description:
Self-copying invoice form Michalczyk & Prokop Faktura wzór pełny in A4 format with 80 sheets (model 101-1E). Designed for issuing duplicate invoices without a separate carbon sheet, this multipart paper produces a copy as you write. Suitable for small businesses, mobile sales, deliveries and on-site invoicing where instant duplicates are required.