There are a number of companies that provide only gift wrap, but that said, why would you want to only offer gift wrap? Gift wrap sales are certainly not as strong as they were a decade ago. Higher prices, less wrap and considerable competition from dollar stores and Wal-Mart. A 'well rounded" catalog with food items (chocolate, cheese, bread mixes, etc), gift items, and magazines will normally sell much better than just gift wrap.
Are there any companies that offer fundraising with only gift wrap? I have been searching, but it seems that all companies I have seen only offer booklets that include gift wrap among their other gift items.