Black Taxi Tours advice

I’m sorry in advance for the tourist BS. Coming over from Glasgow next month for a few days with my Canadian GF. She’s never been to NI. We are both artists and I want to show her a lot of the murals. I don’t want any propagandistic tour that favours one side over the other. I’m also a penny pinching jock c*nt so I don’t wanna pay £100 like some of the websites state. Any advice is much appreciated.