A fun and inexpensive date can be doing a hobby together. If your partner has a hobby that you have never tried, you can arrange to do it together. If you have a hobby that your partner has never tried and you believe that he/she would enjoy it, you can make plans to do it together. If you both share a hobby, you can set a regularly scheduled date to work on it together.
If you both don’t have a hobby, finding one that you both enjoy can be a great way to spend quality time together. You can look in the local community newsletter to see if there are classes being offered in something that interests both of you. These classes are usually quite inexpensive and the two of you can enjoy a few hours each week together learning something new.