Cash Register ect

We are in our second year of operations as a food vendor at various events. This year we got accepted to a county fair and we are really excited as it will be our biggest event to date. My question is, we have to have a cash register that has a Z function and provide tape at the end of each day to the fair. There are tons out there. I dont want to spend a ton of money since this is so far our only fair this year. Any suggestions on what to look for in a register? Thanks!