There is a PayPal alternative to Square if you are using an iPhone/iPad. It is a credit card swiper from AppNinjas (
https://appninjas.com/swipe/). You purchase the credit card swiper from AppNinjas and download the "Swipe" app. You can then set-up the account to work with your PayPal account. The only fees you will incur, after buying the swiper, are PayPal's standard processing fees.
I use this with a non-profit I run. Since I already utilized PayPal I really did not want to set-up another account with Square. The credit card swiper with AppNinjas has worked out great! (I use PayPal invoicing with my VA clients, so I have no need to run their credit cards.)
Julie