Your numbers are pretty low. My software can do a million forms per server every 24 hours, and I can do 8-10 million forms everyday at scale...
In your case, there are great free solutions such as solving Recaptcha by audio challenge speech to text using python & FFMPEG (You could PM me for the code) and OCR Tesseract + free libraries for the easy ones. The audio challenge method doesn't scale very well beyond low 5 figures though, but its just fine for your numbers...
You need to nail your KPIs and have a formula for profitability first to determine what it's worth paying for to external solver services. I am prettty happy with Antcpt (Russian), and I have set it at $300 per 1k bid which is high. There are many solutions, at scale the homegrown solutions start to break down and it's a constant arms race and war- that's why I don't mind using the external solvers API and paying them. They are dedicated to the task.