Cheapest way to run Claude Opus 4.8 on a <$30 monthly budget?

Which option gives the most actual Opus 4.8 usage volume: Kiro Pro, Claude Pro or something else? My monthly budget is $30. Once I burn that, I will switch to DeepSeek or something similar for the rest of the month. I have been running DeepSeek v4 Pro and Gemini 3.1 Pro/3.5 Flash (I have Gemini AI Pro sub) as my daily drivers, but got access to Opus 4.8 through Kiro last week and the quality difference was hard to ignore. It caught and resolved bugs that the other models had missed across 20+ audit passes,