Bing alternative

Has anyone come across a good, easy-to-implement alternative to Bing for hi-rez imagery for terrain? I’m running up agains the 1000-sessions/month limit on a proof-of-concept I’ve got in development, even without showing it to anyone else, and it’s driving me nuts. I’m using Sentinel for most of my QA, but the resolution is so low that I can’t really get a good idea what it looks like, and certainly can’t show it to my coworkers.