You can take a look over https://tron.network/wallet?lng=en.

There is a variety of wallets listed over there. TronLink Wallet is the one that seems the most popular for Tron, AFAIK. You did not have to put any personally identifiable information(PII) like address and name. Nevertheless, this wallet is not open source, if it's a concern for you, so, DYOR.

There is no cheapest wallet, each Tron wallet will work the same in regard to transaction fees. A wallet should have an option or configuration that set the fee each you make a transaction, so just pick the cheapest gas fee that will be available in the occurrence.