There are any number of inexpensive amps on Amazon that will work. Just start searching for your key words-10w, 8ohm, Bluetooth. The wattage isn’t critical, you can use a more powerful amp, you just can’t crank it without risking blown speakers. 8ohms is common enough, anything you find should be perfect.
I have one of these, and while it’s way more power than you need, it works pretty flawlessly.