1. Computer - even an old fart one, can be a recorder. Software is free.
2. Apple iPhone or iPod - you may already have one. Cheaper than a computer. Apps are really cheap. Also iPad, but not economical.
3. Don't really need to use your amp for recording practice. You can go direct from instrument to recorder. Software can emulate that Ampeg. Well, close anyway.
Fender P #913 - P&W Bassists #1105 - Wash. Bassists #81 - Greenboy Designs #101