[D] What is the best way to quickly and affordably source data for fine-tuning?

If you wanted to source 10,000 high-quality input/output pairs for DPO or preferences for KTO, what's the best approach?

From what I understand, you cannot use GPT4 to create synthetic data (that would be used to train a commercial model) as that violates their terms.

commercial data fine-tuning gpt4 machinelearning quality source data synthetic synthetic data terms train