The following cooperative government contracts typically cover point of sale software and systems including:

POS systems
cafeteria point of sale, POS systems
food service management tools

Active Cooperative Contracts for Point of Sale Systems

cooperative affiliation: TIPS active contract from Region 8 ESC, TX
Food Service Management Tools (including Software)
cooperative affiliation: Sourcewell active contract from Sourcewell, MN
Software as a Service Business Solutions for K-12 School Districts

Purchasing Cooperatives you can work with for Point-of-Sale Software and Systems

Sourcewell

The Interlocal Purchasing System (TIPS)