blinds.com - $27 each.

Here is a link that might be useful: blinds.com

I have gone through blinds.com. Years ago.

Does each window have its own casement? Can you treat two, or more, windows as one and use wider blinds?

Another option is to leave the window without any treatments. Leave it bare and let the sun shine in and leave the window coverings up to the buyer. Or, hang up inexpensive white sheers. I'm not sure if going the sheer route is practical if you have to drill holes in wall. Tension rods are always easy, but not for a bay window.

You don't want to spend too much getting the house ready to sell, and you definitely don't want to put any more holes in it. We actually went around removing nails, screws, etc and patching and painting them before listing.

Cheapest thing to do? Get spring tension rods. Buy some cheap fabric that coordinates. Cut FLAT pieces to fit the windows with enough extra to turn in the sides, hem the bottom and put a rod pocket at the top. I did that for our dining room and they looked like custom-made, fabric covered shades. Of course, they don't go up and down, but for showing the house, they don't have to. Buy your fabric at Walmart in the $1-2 clearance section and you'll be able to get all the fabric you need for under $10-15