I'll be soon launching an MVP. There is an issue however. I can't yet afford .com domain. If I had the money, I'd sure buy it because the name is great. It's for sale for 3000$. I bought the .io domain though. So the question is should I use this .io domain for MVP launch which if product becomes successful I'll just switch later to .com (potentially risking somebody picking up the .com domain, after seeing the product) or should I choose other, maybe even similar sounding, low-cost domain name, and later if the product becomes successful switch to that 3000$ .com domain (not risking picking it up by anybody, but changing brand name in the process)...

EDIT: the product is not tech, it's for financial markets investors.

EDIT2: Thank you for the comments. I decided to change the name to MarketsLake and just bought it for a few bucks (that 3k domain was MarketHunt and all of the other cool domains like marketspy, marketscout, marketseek, etc etc are obviously taken)