I've never used it, but I think Google Colab has a free plan. As another option, you can rent a machine with a decent GPU on vast.ai. An Nvidia 3090 can be ren

I've never used it, but I think Google Colab has a free plan. As another option, you can rent a machine with a decent GPU on vast.ai. An Nvidia 3090 can be rented for about $0.20/hr.