Cryptocurrency

It depends on what exactly you are intending to do. Ethereum might not be out of the question. While it's true that under certain circumstances transaction fees can get quite high, at the moment they are quite reasonable and have been for quite some time. They tend to only shoot up to outrageous levels during a bull market or when something get's hyped up and released on the chain. Other than that it usually ok. The thing about other, cheaper chains is that they tend to be less secure. You never know when something unforeseen might happen which could cost you money. Not that Ethereum is immune to that sort of thing but it does have a pretty decent track record in that regard.

To try to actually answer your question, I think Solana has pretty cheap transactions. Maybe cardano. Binance chain, Tron, Avalanche, the list goes on. The only problem is, there isn't a heck of a lot going on on these chains so far.