When my daughter started K (2000), Plano was short on substitutes. I was asked to apply to sub because I do have my degree and I have subbed ever since at the same school.
It would be easy for me to sub 3 days a week but I limit it to 1 or special reasons. My jobs are all pre done so I don't get the 10:30pm or 5:30am calls.
A lot of subs can work daily if they work at several schools. Like you, my hubby is on the road so I can't do nights and I have to get daughter to/from school.
Retail part time during day time or weekends.
MLM's are not my thing and I tend to steer clear of people I know in them but some people love them. Just be VERY careful if you sign onto one of them. You'll get plenty of offers here.
Good luck.