Yeah, Haiku 3.5 doesn't really count as a budget model - Anthropic have kept the original Claude 3 Haiku around for their budget entry.

I collected notes on the lowest cost hosted LLMs from the major vendors when I wrote up Amazon Nova last week: https://simonwillison.net/2024/Dec/4/amazon-nova/

Nova Micro is $0.035/$0.14 and Google's Gemini 1.5 Flash 8B is $0.0375/$0.15 - just beating those OpenRouter prices, but it may well be that the Qwen models provide better results.