No single 'cheapest' hardware wallet is fixed: prices and supported coins change. To find the lowest-cost option that still supports Ethereum and Solana, compare entry-level hardware wallets from established vendors on their official sites (avoid reseller markups/scams). Check each vendor's current compatibility list for native or companion-app support of Ethereum (and EVM chains) and Solana. Key features to require: offline key storage, PIN, recovery seed backup, optional passphrase, open-source firmware where available, and a desktop/mobile companion app. Solana support is less universal than Ethereum, so confirm it explicitly; some wallets need a third-party wallet connector. Tradeoff: hardware wallets keep keys offline and are safer against malware, but cost money and are less convenient for frequent small transactions. Mobile/software wallets are free and convenient but are 'hot' (keys on an internet-connected device), so use them only for small amounts. If budget is tight, a basic hardware wallet can be the cheapest secure route, but do not sacrifice backup or vendor reputation. Prices vary; check official stores for current cost. Also verify firmware update policy and whether the device works with your phone/computer. Never buy a used or pre-initialized device.