[BFCL] SerpApi is so expensive！is there any cheaper search api to alternative? And how many calls are needed to complete the web searches for these 200 pieces of web search data？

Hi, We only have 250 free SerpApi search queries, but there are a total of 200 pieces of web search data, and these data involve multi-hop. So，i want to know:

1. Approximately，how many calls are needed to complete the web searches for these 200 pieces of data？ 2. Is there any cheaper search api to alternative？