Check your local library they might have theme bins you can sign out for a wk with a few books on the theme and props etc! Although if you make your own I think that's a great idea I might do too at 1st might take a while but make them so you can reuse them kids learn through repetition so have a bin for each season > only 4 then make a few with basic themes like farm zoo space and rotate them 1 wk winter next farm then back to winter then zoo then winter for variety have a colour and a # or letter of the wk and change those ... dollarama or your local dollar store is great for supplies for the bins
Just make sure if you're going to spend your time on these things that you can reuse them so in the long run you have more time with family.